Mailjet

Name: Mailjet
Brand: Mailjet
Price: 060009 USD

Marketing campaigns and transactional email on one account, metered by emails sent

Mailjet is a European email platform that covers both jobs in this category from a single account: marketing campaigns and newsletters sent to a contact list, and transactional email such as receipts and password resets sent through an API or SMTP; unusually, it is priced on monthly emails sent rather than on contacts stored, with unlimited contacts on its paid plans, EU data centres, and a real-time collaborative email editor.

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Overview

Mailjet was founded in Paris in 2010 and built its reputation on two things: European data hosting at a time when almost every competitor was American, and MJML, the open-source responsive email markup language it created and released in 2016, which is now used well beyond Mailjet's own customer base. It merged with Mailgun under the Pathwire holding company in 2019 and was acquired by Sinch as part of the roughly $1.9 billion Pathwire deal that closed in December 2021. Inside Sinch it is deliberately positioned as the marketer-facing product to Mailgun's developer-facing one.

The pricing model is what makes it interesting for this directory. Almost every marketing platform here bills on contacts stored, which means a large list you rarely mail is expensive. Mailjet bills on emails sent, with unlimited contacts on the Essential tier and above. Free covers 6,000 emails a month capped at 200 a day with 1,000 contacts. Starter is $9 for 8,000 emails and 2,000 contacts. Essential is $17 for 15,000 emails with unlimited contacts and segmentation. Premium is $27 for the same 15,000 emails and adds automation, A/B testing, and up to twenty sub-accounts. Volumes scale from there and annual billing saves ten percent.

That inversion changes the arithmetic dramatically at the edges. A 50,000-contact list mailed once a month is 50,000 emails, which is a modest Mailjet bill, against $460 a month on Constant Contact Standard for the same list. Conversely a 1,000-contact list mailed daily is 30,000 emails a month, which costs more on Mailjet than a platform charging by contact would. Model your own send frequency before choosing; this is the single most consequential thing about the product.

What you should not expect is depth. Automation is a Premium-tier feature and it is simple, segmentation arrives only at Essential, and there are no landing pages, webinars, events, or CRM. The transactional side is genuinely capable, with API and SMTP sending, dynamic templates, inbound parsing, real-time webhooks, sub-accounts, and detailed message logs, but it does not match Postmark's stream separation or retention. Mailjet is broad and cheap rather than deep, and it is the most credible single-vendor answer here for a small business that needs both marketing and transactional email without buying two products.

Best for

Small businesses and European companies that need both marketing campaigns and transactional email from one vendor, especially those with a large list they mail infrequently, where per-email pricing is dramatically cheaper than per-contact pricing.

Not the right fit for

Businesses that need serious marketing automation; automation is a Premium-tier feature and it is simple, with none of the branching depth of ActiveCampaign, Klaviyo, or Omnisend.
Anyone sending to a small list very frequently; a 1,000-contact list mailed daily is 30,000 emails a month, which costs more on Mailjet's per-email meter than on a per-contact platform.
Teams whose transactional email is a critical engineering dependency; Mailjet lacks Postmark's message stream separation and long retention and Mailgun's routing rules, and Sinch positions Mailgun rather than Mailjet for that job.
Buyers wanting landing pages, webinars, events, courses, or a CRM in the same account; Mailjet is email and nothing else.
Cold outreach and purchased-list senders; Sinch enforces its acceptable use policy with suspension, and because the account may carry your transactional traffic too, a marketing violation can take down your password resets.

How it works

1
You add a sending domain and publish the SPF and DKIM records Mailjet generates, then decide whether the account will send marketing, transactional, or both. Sub-accounts on the Premium tier let you separate those streams and separate customers or brands from each other.
2
For marketing, contacts are imported or collected through forms into contact lists, then targeted with segments built from contact properties and behaviour on the Essential tier and above. Campaigns are composed in a drag-and-drop editor that supports real-time collaboration, so two people can work on the same email at once with comments, which no other platform in this category offers.
3
Templates can also be written in MJML, Mailjet's own open-source markup language, which compiles to responsive HTML that survives Outlook. This is the feature that developer-adjacent marketing teams actually stay for.
4
For transactional, your application calls the Send API or relays through SMTP using libraries for PHP, Ruby, Python, C#, Java, and Node.js. Templates are rendered server side with recipient variables injected, so the payload is data rather than markup. Inbound email can be parsed programmatically for reply handling.
5
Everything reports back through real-time event webhooks for delivery, opens, clicks, bounces, spam complaints, and unsubscribes, plus message logs with per-message status history. Email validation credits are bundled on the paid tiers to clean addresses before you send to them.

Feature breakdown

29 features in 5 modules

Email creation

The most distinctive part of the product.

Real-time collaborative editor: Multiple people can edit the same email simultaneously with comments and locked sections, which is genuinely unique in this category and removes the usual round of screenshots and change requests.
MJML markup language: Mailjet created and open-sourced MJML, a responsive email markup language that compiles to HTML which renders correctly across clients including Outlook. It is used widely outside Mailjet and is a real asset for technical teams.
Drag-and-drop builder: Block-based composer with a template library, mobile preview, and a code view for teams that want to write the markup themselves.
Dynamic templates with variables: Templates stored in Mailjet and rendered server side with recipient variables injected at send time, used by both the marketing and transactional sides.
Locked sections and brand control: Sections of a template can be locked so non-designers editing a campaign cannot break the brand layout.
A/B testing: Test subject lines and content variants, available from the Premium tier.

Marketing campaigns

Complete enough for a newsletter, thin beyond that.

Unlimited contacts on paid plans: Essential and Premium carry unlimited contacts, so you are metered only on emails sent. This is the structural difference from every contact-priced platform in this category.
Contact lists and properties: Import or collect contacts with arbitrary custom properties, exclusion lists, and automatic suppression of bounces and unsubscribes.
Segmentation: Segments built from contact properties and engagement, available from the Essential tier upward rather than on Free or Starter.
Automation: Trigger-based sequences such as welcome series and date-driven flows, reserved for the Premium tier. Simple by the standards of a dedicated marketing platform.
Sign-up forms: Embeddable subscription forms writing directly into a contact list with double opt-in support.
Scheduling and send optimisation: Schedule campaigns ahead, with delivery pacing handled by Mailjet rather than by you.

Transactional email

A real API, on the same account as the marketing.

Send API and SMTP relay: Both interfaces available, with official libraries for PHP, Ruby, Python, C#, Java, and Node.js plus a documented HTTP API.
Real-time event webhooks: Delivery, open, click, bounce, spam complaint, blocked, and unsubscribe events posted to your endpoint as they happen.
Inbound email parsing: Point an address or domain at Mailjet and incoming mail is parsed and posted to your application, which puts it alongside Postmark, Mailgun, and SendGrid rather than Resend on this capability.
Message logs with status history: Every message tracked with its full delivery status history, searchable in the console for support and debugging.
Sub-accounts: One on Free, Starter, and Essential, up to twenty on Premium, and unlimited on Custom. Sub-accounts isolate sending reputation and statistics between brands, tenants, or between marketing and transactional streams.
Templating at scale: Render templates dynamically with per-recipient variables injected in bulk, so a hundred thousand personalised receipts are one API pattern rather than a hundred thousand rendered payloads.

Deliverability and compliance

The European argument, made properly.

EU data centres: Mailjet operates European data centres, which is a genuine procurement advantage over US-hosted competitors and was the company's original differentiator.
ISO 27001, SOC 2, and GDPR: Certified to ISO 27001 and SOC 2 with GDPR compliance as an EU-established processor.
Domain authentication: Guided SPF and DKIM setup with DMARC guidance, and verification status per sending domain.
Email validation credits: Bundled validation credits on the paid tiers, 500 on Essential and 2,000 on Premium at higher volumes, for cleaning addresses before you send.
Dedicated IPs: Available from the 100,000-email plans, with one IP included and additional IPs purchasable, which is a higher threshold than Mailgun's 50,000.
Automatic suppression: Hard bounces, spam complaints, and unsubscribes are suppressed automatically across the account and readable through the API.

Administration and support

Adequate, with the useful controls on Premium and above.

Team collaboration: Multiple users with role-based permissions, which combined with the collaborative editor makes Mailjet unusually good for teams reviewing campaigns together.
API key management: Per-sub-account API keys so an application credential cannot administer the whole account or send from another brand's domain.
Priority support: Phone and chat support on the Premium tier; lower tiers are ticket-based.
Technical account management: A dedicated technical account manager and structured onboarding on the Custom tier.
Statistics and reporting: Real-time campaign and transactional analytics with per-sub-account breakdowns, comparison views, and exportable data.

Use cases

4 documented

Business with a large list mailed monthly

Fifty thousand contacts receive one newsletter a month, and a contact-priced platform charges several hundred dollars for the privilege of storing them.

Mailjet meters the 50,000 emails actually sent rather than the 50,000 contacts stored, which is a fraction of what Constant Contact charges at $460 a month on Standard for the same list.

Small SaaS needing both marketing and transactional email

A monthly product update goes to the user base and the application sends receipts and password resets, currently requiring two vendors, two contracts, and two invoices.

Mailjet covers both from one account with sub-accounts on Premium separating the streams, at a total cost lower than most transactional providers charge alone.

Marketing team that reviews campaigns collaboratively

Every campaign goes through three rounds of screenshots, tracked changes in a document, and copy-paste back into the editor.

The real-time collaborative editor lets the writer, the designer, and the approver work in the same email simultaneously with comments and locked brand sections, which no other platform in this category offers.

European company with data residency requirements

Procurement requires that subscriber and customer email data be processed in the EU, and most of the mainstream platforms are US-hosted.

Mailjet's European data centres, ISO 27001 and SOC 2 certifications, and EU establishment answer that requirement directly without needing a transfer mechanism argument.

Pricing

from $0 for 6,000 emails a month, then $9 a month (Starter)

Metered on monthly emails sent rather than on contacts stored, with unlimited contacts on the Essential tier and above. Four published tiers plus a quoted Custom tier, scaling with send volume.

Plan	Price	Includes
Free	$0 per month	6,000 emails a month, capped at 200 a day 1,000 contacts API, SMTP, and templates 1 sub-account No segmentation, automation, or A/B testing The 200-a-day cap is the real limit; a single campaign to 1,000 contacts takes five days to send.
Starter	$9 per month	8,000 emails a month 2,000 contacts No daily sending limit 1 sub-account No segmentation or automation Removing the daily cap is the entire point of this tier. Feature-wise it is the free plan with more headroom.
Essential	$17 per month, scaling with send volume	15,000 emails a month at the entry point Unlimited contacts Segmentation 500 email validation credits 1 sub-account Unlimited contacts starts here, which is the tier where Mailjet's pricing model becomes genuinely differentiated.
Premium	$27 per month, scaling with send volume	15,000 emails a month at the entry point Unlimited contacts Automation and A/B testing Up to 20 sub-accounts 2,000 validation credits at higher volume plans Priority phone and chat support Automation and A/B testing are Premium-only, so most businesses buying Mailjet for marketing rather than transactional need this tier.
Custom	Quoted custom	Negotiated high-volume rates Unlimited sub-accounts Dedicated technical account manager Comprehensive onboarding

Add-ons

Dedicated IP (Included from the 100,000-email plans, additional IPs purchasable): The threshold is higher than Mailgun's 50,000-email tier.
Email validation credits (Bundled on paid tiers, purchasable beyond the allowance)

Billing notes

Mailjet meters emails sent, not contacts stored, and Essential and Premium carry unlimited contacts. This inverts the economics of every contact-priced platform in this category and is the single most important thing to understand before buying.
Because contacts are not billed, unsubscribed and inactive contacts cost you nothing to keep. The classic hidden cost of contact-priced marketing platforms simply does not exist here, though good list hygiene still protects your deliverability.
The corollary is that send frequency is what costs money. A 1,000-contact list mailed daily is 30,000 emails a month and will cost more than on a per-contact platform; a 50,000-contact list mailed monthly is 50,000 emails and will cost far less.
The free plan is capped at 200 emails a day as well as 6,000 a month, so a single campaign to a full 1,000-contact list takes five days. Removing that daily cap is the main reason to move to Starter at $9.
Segmentation begins at Essential and automation and A/B testing begin at Premium, so the marketing feature ladder is steeper than the price ladder suggests.
Annual billing carries a 10 percent discount, which is modest compared with the 15 to 30 percent offered elsewhere in this category.
Dedicated IPs are only available from the 100,000-email plans, so small senders cannot buy IP isolation.

Value assessment: Because Mailjet meters sends rather than contacts, the standard comparison points need translating. A 1,000-contact list mailed once a month is 1,000 emails, comfortably inside the free plan, though the 200-a-day cap means the send takes five days; $9 on Starter fixes that. A 10,000-contact list mailed once a month is 10,000 emails, inside the $17 Essential tier with room to spare, against $120 to $275 on Constant Contact and $100 to $135 on AWeber for the same list. A 50,000-contact list mailed once a month is 50,000 emails, which needs a higher volume step but still lands far below the $430 to $575 Constant Contact charges. Mail that same 50,000-contact list weekly and the picture changes: 200,000 emails a month moves Mailjet up several volume steps while the contact-priced platforms charge exactly the same as before. Mailjet is outstanding value for a large list mailed occasionally and merely competitive for a small list mailed often. Add the transactional API on the same account, which replaces a separate Postmark or Resend subscription for low-volume application mail, and the total-cost case for a small business gets stronger still.

Strengths & limitations

Strengths

Priced on emails sent with unlimited contacts on paid plans, which is dramatically cheaper than contact-based pricing for a large list mailed infrequently and eliminates the dormant-contact hidden cost entirely.
Covers both jobs in this category from one account: marketing campaigns and a genuine transactional API with inbound parsing, webhooks, and message logs.
The real-time collaborative email editor with comments and locked sections is unique in this category and removes an entire review cycle for teams.
MJML, the open-source responsive email markup language Mailjet created, is genuinely good and is used far beyond Mailjet's own customer base.
European data centres, EU establishment, ISO 27001, and SOC 2, which is the strongest data residency position among the cheap platforms here.
Sub-accounts on Premium isolate sending reputation and statistics between brands, tenants, or between marketing and transactional streams.
Very low entry pricing, with a free plan, a $9 tier that removes daily caps, and unlimited contacts from $17.
Backed by Sinch, a listed Swedish CPaaS group, which is a stable ownership position after a decade of changes.

Limitations

Automation is Premium-only and simple, with none of the branching or behavioural depth of ActiveCampaign, Klaviyo, or Omnisend.
Segmentation does not exist below the Essential tier, so the cheap plans are broadcast tools rather than marketing platforms.
No landing pages, webinars, events, courses, or CRM; Mailjet is email and nothing else, which limits how much of a stack it can consolidate.
The free plan's 200-emails-a-day cap makes it close to unusable for real campaigns, and it takes five days to mail a full 1,000-contact list.
The transactional side lacks Postmark's message stream separation and long retention and Mailgun's routing rules; Sinch positions Mailgun rather than Mailjet for serious transactional work.
Dedicated IPs are gated at the 100,000-email plans, higher than Mailgun's 50,000 threshold.
The annual discount at 10 percent is the smallest in this category.
Repeated ownership changes over the last decade, from independent to Pathwire to Sinch, with the product now positioned as the junior sibling to Mailgun inside a large group.

Head-to-head comparisons

5 alternatives

Mailjet vs Mailgun

from $15 a month for 10,000 emails (Basic)

The sibling product inside Sinch, split deliberately: Mailgun for developers, Mailjet for marketers. Mailgun has far better inbound routing with pattern-matched rules, better address validation, longer log retention on Scale, and dedicated IPs from 50,000 emails rather than 100,000. Mailjet has a campaign builder, contact lists, segmentation, automation, and the collaborative editor, none of which Mailgun attempts. There is no shared contact base between them. If your primary need is transactional infrastructure, buy Mailgun; if it is marketing with transactional attached, buy Mailjet.

Full Mailjet vs Mailgun comparison

Mailjet vs Sender

from $0 free for 2,500 subscribers, then from $7 a month (Standard)

Both are cheap EU-based platforms doing marketing and transactional email in one account, but they meter opposite ways. Mailjet prices on emails sent with unlimited contacts, Sender on subscribers with a send multiplier. Mailjet wins for a large list mailed rarely; Sender wins for a small list mailed often, and its free tier at 2,500 subscribers is far more usable than Mailjet's 200-a-day cap. Sender has better automation, landing pages, popups, and SMS; Mailjet has the stronger transactional API, inbound parsing, sub-accounts, and the collaborative editor.

Full Mailjet vs Sender comparison

Mailjet vs Constant Contact

from $12 a month (Lite, up to 500 contacts)

The clearest illustration of what per-email pricing does. A 50,000-contact list mailed monthly costs a modest Mailjet volume step against $460 a month on Constant Contact Standard, and a 10,000-contact list is $17 on Mailjet Essential against $160. What Constant Contact has that Mailjet does not is event registration with ticketing, social and ads management, landing pages, phone support, and local training. Mailjet is the better economics by a wide margin; Constant Contact is the better product for a small business owner who needs guidance.

Full Mailjet vs Constant Contact comparison

Mailjet vs Brevo

from $0 (free, 300 emails per day), then $9/mo on Starter at 5,000 emails

The closest strategic comparison: both are European, both meter on emails sent rather than contacts, and both cover marketing and transactional in one account. Brevo goes considerably further with a CRM, SMS, WhatsApp, chat, meetings, and much deeper automation, and it is the more complete platform. Mailjet is simpler and cheaper at the entry, has the collaborative editor and MJML, and offers sub-accounts for tenant isolation. Most small businesses choosing on features should look at Brevo first; choose Mailjet if the editor, MJML, or sub-accounts matter to you specifically.

Full Mailjet vs Brevo comparison

Mailjet vs MailerLite

from $10.80/mo (Comfort, up to 500 subscribers, billed annually; $12 monthly)

MailerLite is the better pure marketing platform: a cleaner interface, a stronger automation builder, landing pages, websites, and a better free tier at 1,000 subscribers and 12,000 emails. It prices on subscribers, so a large infrequently mailed list costs considerably more there than on Mailjet. MailerLite also has no meaningful transactional API. Choose MailerLite for marketing depth and polish, Mailjet when per-email pricing suits your send pattern or you need transactional mail on the same account.

Full Mailjet vs MailerLite comparison

Implementation & onboarding

Setup time: A few hours. Add a sending domain, publish SPF and DKIM, import contacts or drop in the API credentials, and send. Nothing is gated behind a sales conversation below the Custom tier.
Learning curve: Low for the marketing side and low for developers on the transactional side. The one concept worth learning deliberately is sub-accounts, which are how you keep marketing and transactional reputation apart and are only available in quantity on Premium.
Onboarding: Fully self-serve on Free, Starter, Essential, and Premium. The Custom tier adds a technical account manager and structured onboarding. There is no time-limited trial because the free plan is permanent.
Migration notes: Contacts import as CSV and Mailjet reviews imports for permission. Because contacts are not billed on Essential and Premium, there is no financial reason to prune before importing, which makes migration simpler than moving to a contact-priced platform, though you should still remove known bounces so a new sending identity does not start badly. Templates can be rebuilt in MJML, which is worth doing properly since it is one of the reasons to be here. Automations and segments do not migrate. If you are consolidating transactional email onto Mailjet as well, set up sub-accounts first so marketing and transactional reputation stay separate from the beginning rather than being untangled later.

Platform, API & security

Platforms: Web applicationREST API v3SMTP relayInbound parsing webhookOfficial libraries for 6 languages
API: REST API v3 covering contacts, lists, segments, campaigns, templates, statistics, and transactional sending, plus an SMTP relay, official libraries for PHP, Ruby, Python, C#, Java, and Node.js, real-time event webhooks for delivery, open, click, bounce, spam, blocked, and unsubscribe, inbound email parsing, and per-sub-account API keys.
Compliance: ISO 27001SOC 2GDPR as an EU-established processorCAN-SPAM
Data residency: European data centres, which was Mailjet's original differentiator and remains a genuine procurement advantage over the US-hosted mainstream platforms.
SSO: Available on Custom and enterprise agreements through Sinch rather than as a published self-serve feature.
Security notes: TLS in transit, per-sub-account API keys, role-based user permissions, and two-factor authentication. Sub-accounts provide hard isolation of sending reputation and statistics between brands, tenants, or between marketing and transactional streams, which is the control most worth configuring on day one.

Support & resources

Channels: Ticket and email support on all plansPriority phone and chat support on PremiumDedicated technical account manager on Custom
Documentation: Developer documentation at dev.mailjet.com covering the API, SMTP, templating, and webhooks, plus a marketing knowledge base and the separately maintained MJML documentation at mjml.io.
Community: A substantial open-source community around MJML on GitHub, which extends well beyond Mailjet's own customers, plus the wider Sinch developer ecosystem.

Company

Founded: 2010
Headquarters: Paris, France, as part of Sinch (Stockholm, Sweden)
Ownership: Owned by Sinch AB (STO: SINCH) since December 2021
Founders: Julien Tartarin, Wilfried Durand
Employees: Part of Sinch, roughly 3,000 employees overall
Funding: Raised venture funding as an independent French company, merged with Mailgun under the Pathwire holding company in 2019 alongside Email on Acid, and was acquired by Sinch as part of the approximately $1.9 billion Pathwire transaction that closed in December 2021.

Funding history

Round	Amount	Year	Notes
Venture funding	Approximately $16M	2013 to 2016	Raised as an independent Paris-based company, with European investors including Iris Capital and Alven.
Pathwire merger	Undisclosed	2019	Combined with Mailgun and Email on Acid under the Pathwire holding company backed by Turn/River Capital.
Acquisition by Sinch	Part of an approximately $1.9B deal	2021	Sinch acquired the whole Pathwire portfolio, closing in December 2021.

Timeline

2010Founded in Paris by Julien Tartarin and Wilfried Durand as a European alternative to the American email platforms, with EU data hosting as the founding differentiator.
2016Releases MJML as open source, a responsive email markup language that compiles to HTML rendering correctly across clients including Outlook; it is adopted well beyond Mailjet's own customer base.
2017Ships the real-time collaborative email editor, letting multiple people work on the same campaign simultaneously with comments and locked sections.
2019Merges with Mailgun and Email on Acid under the Pathwire holding company, positioning Mailjet as the marketer-facing product and Mailgun as the developer-facing one.
2021Sinch acquires the Pathwire portfolio for approximately $1.9 billion, closing in December.
2026Continues as Sinch's marketing-facing email product, competing on per-email pricing with unlimited contacts, EU hosting, and the collaborative editor rather than on automation depth.

Integrations

WordPress and WooCommerce
Shopify, PrestaShop, and Magento
Salesforce and Pipedrive
Zapier and Make
Segment
Drupal and Joomla
PHP, Ruby, Python, C#, Java, and Node.js libraries
Mailgun and Email on Acid as sibling Sinch products
MJML tooling and editor plugins
Real-time webhooks into any HTTP endpoint

Frequently asked questions

10 questions

What is Mailjet?

Mailjet is a European email platform covering both marketing campaigns and transactional email from one account. It sends newsletters to contact lists with a drag-and-drop and collaborative editor, and sends application email such as receipts and password resets through a REST API or SMTP with webhooks, inbound parsing, and message logs. Founded in Paris in 2010, it is owned by Sinch and hosts data in European data centres.

How much does Mailjet cost?

Free covers 6,000 emails a month capped at 200 a day with 1,000 contacts. Starter is $9 a month for 8,000 emails and 2,000 contacts with no daily cap. Essential is $17 for 15,000 emails with unlimited contacts and segmentation. Premium is $27 for 15,000 emails plus automation, A/B testing, and up to twenty sub-accounts. All tiers scale with send volume beyond the entry point, and annual billing saves 10 percent.

Does Mailjet charge by contacts or by emails sent?

By emails sent, which is unusual in this category and is the most important thing to understand about it. Essential and Premium carry unlimited contacts. That makes Mailjet dramatically cheaper than contact-priced platforms for a large list mailed occasionally, and more expensive for a small list mailed daily. A 50,000-contact list mailed monthly is 50,000 emails on Mailjet against $460 a month on Constant Contact Standard for the same list.

Do unsubscribed or inactive contacts cost me anything on Mailjet?

No. Because billing meters emails sent rather than contacts stored, and paid plans carry unlimited contacts, a dormant or unsubscribed contact costs nothing to keep. The classic hidden cost that inflates Mailchimp and ActiveCampaign bills does not exist here. Good list hygiene still matters for deliverability, since bouncing and complaining recipients damage your sending reputation regardless of what they cost.

Can Mailjet replace my transactional email provider?

For low to moderate volume, yes. It has a real Send API, an SMTP relay, dynamic templates, real-time event webhooks, inbound parsing, sub-accounts, and message logs with status history. What it lacks is Postmark's Message Streams separation and long retention and Mailgun's rule-based inbound routing. Sinch positions Mailgun rather than Mailjet for serious transactional work, which tells you where the depth is. If transactional email is a critical engineering dependency, buy a dedicated provider.

How good is Mailjet's marketing automation?

Basic. Automation is a Premium-tier feature and covers welcome series and date-triggered sequences rather than deep behavioural branching. Segmentation does not exist at all below the Essential tier. If sophisticated automation is why you are shopping, ActiveCampaign, Klaviyo, Omnisend, or Brevo all go considerably further. Mailjet's strengths are the pricing model, the collaborative editor, and the transactional API, not the automation.

What is MJML?

MJML is an open-source responsive email markup language that Mailjet created and released in 2016. You write simplified markup and it compiles to HTML that renders correctly across email clients including Outlook, which is otherwise a miserable problem. It is used far beyond Mailjet's own customer base and has become a small standard in its own right. For a technical marketing team, it is one of the better reasons to choose Mailjet.

Is Mailjet good for GDPR and EU data residency?

Yes, and it was the founding pitch. Mailjet operates European data centres, is EU-established as a French company, and holds ISO 27001 and SOC 2 certifications alongside GDPR compliance. That removes the transfer-mechanism argument that US-hosted platforms have to make with European procurement. Note the ultimate parent, Sinch, is Swedish, so the ownership chain stays within Europe too.

Why is Mailjet's free plan capped at 200 emails a day?

To make it a trial rather than a usable plan. Six thousand emails a month sounds generous until you notice the daily cap means a single campaign to a full 1,000-contact list takes five days to send. Removing that cap is the entire purpose of the $9 Starter tier. If you want a free plan you can actually run a business on, Sender gives 2,500 subscribers and 15,000 emails with no daily limit.

Who owns Mailjet?

Sinch AB, the listed Swedish CPaaS group, which acquired the Pathwire portfolio including Mailjet, Mailgun, and Email on Acid for approximately $1.9 billion in a deal that closed in December 2021. Mailjet was founded independently in Paris in 2010, raised European venture funding, and merged with Mailgun under Pathwire in 2019. Inside Sinch it is the marketer-facing product to Mailgun's developer-facing one, with no shared contact base between them.

Editorial verdict

Mailjet is the one platform in this category that meaningfully changes the arithmetic rather than the feature list. Metering emails sent instead of contacts stored, with unlimited contacts from $17 a month, makes it dramatically cheaper than everything else here for a business with a large list it mails occasionally, and it removes the dormant-contact hidden cost entirely. Add a genuine transactional API with inbound parsing and sub-accounts on the same account, European data centres, the only real-time collaborative email editor in the category, and MJML, and the case for a small European business is strong. The limits are equally clear. Automation is Premium-only and shallow, segmentation does not exist below Essential, there are no landing pages or events or CRM, and the free plan's 200-a-day cap makes it a demo rather than a plan. On the transactional side Sinch clearly reserves the depth for Mailgun. Buy Mailjet when your send pattern favours per-email pricing, when you want both jobs from one vendor at low cost, or when EU hosting is a requirement. Buy something else if the automation is what you are actually shopping for.

Written by the SaaSTracker editorial team. Awards, when shown, are judged against the published criteria in our methodology.