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Mailgun vs Mailjet

An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.

The short answer

Both sides assessed

Mailgun compared with Mailjet

The sibling product inside Sinch, and the two are sold as a deliberate split: Mailgun for developers, Mailjet for marketers. Mailjet has a campaign builder, contact lists, segmentation, and automation that Mailgun does not attempt, plus its own transactional API, and it is EU-headquartered with EU hosting. Mailgun has far better inbound routing, address validation, and raw API primitives. There is no shared contact base between them, so running both means two accounts. Most buyers should pick one job and buy the product built for it.

Mailjet compared with Mailgun

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.

Choose Mailgun if

Development teams that need transactional sending plus real inbound mail routing, particularly applications that receive and process email as a core feature, and anyone who wants list validation and sending from the same vendor.

Choose Mailjet if

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.

Side by side

13 attributes
AttributeMailgunMailjet
CategoryESPsESPs
Starting price$15 a month for 10,000 emails (Basic) (free plan available)$0 for 6,000 emails a month, then $9 a month (Starter) (free plan available)
Pricing modelVolume-metered on emails sent, with four tiers that differ mainly in included volume, log retention, inbound route allowance, and dedicated IP availability. Email validation is metered separately.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.
Free plan100 emails a day, one inbound route, and one day of log retention. No dedicated IP option.6,000 emails a month capped at 200 a day, with 1,000 contacts, one sub-account, and Mailjet branding on messages.
Free trialOne free month on Foundation and ScaleNo
Best forDevelopment teams that need transactional sending plus real inbound mail routing, particularly applications that receive and process email as a core feature, and anyone who wants list validation and sending from the same vendor.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.
Setup timeHalf a day for outbound: add the domain, publish the SPF, DKIM, and tracking DNS records, wait for verification, and drop in the SDK or SMTP credentials. Inbound takes longer because MX changes need planning and routes need designing.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 curveModerate. The sending API is conventional, but Mailgun's route expression syntax, the distinction between sandbox and verified domains, and the interaction between suppression lists and your own database all take a session to understand properly.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.
PlatformsWeb console, REST API, SMTP relay, Inbound routes and webhooks, Official SDKs for 7 languagesWeb application, REST API v3, SMTP relay, Inbound parsing webhook, Official libraries for 6 languages
ComplianceSOC 2 Type 2, ISO 27001 through Sinch, GDPR with a data processing agreement, HIPAA arrangements available on enterprise termsISO 27001, SOC 2, GDPR as an EU-established processor, CAN-SPAM
Founded20102010
HeadquartersSan Antonio, Texas, United States, as part of Sinch (Stockholm, Sweden)Paris, France, as part of Sinch (Stockholm, Sweden)
OwnershipOwned by Sinch AB (STO: SINCH) since December 2021Owned by Sinch AB (STO: SINCH) since December 2021

Strengths and limitations

Mailgun

Strengths

  • The best inbound email handling in the category: pattern-matched routes with forward, store, and post actions, priority ordering, full MIME parsing, and retrievable message storage.
  • Email Address Validation from the same vendor, which removes a separate tool and a separate contract for list hygiene.
  • Volume-based pricing means dormant contacts are free, which is structurally cheaper than any contact-priced marketing platform for product notification traffic.
  • Mature API primitives including batch sending with per-recipient variables, versioned templates, tags for reporting, and a queryable Events API rather than only webhooks.

Limitations

  • One day of log retention on Free and Basic is close to indefensible, and even Foundation's five days is short against Postmark's 45-day default and 365-day ceiling.
  • No marketing capability whatsoever; Sinch's answer to that is Mailjet, a separate product with a separate account and no shared contact base.
  • The console is heavier and slower than Resend's, and the overall experience reads as enterprise software rather than a developer tool despite the developer positioning.
  • Support quality is a common complaint, particularly on lower tiers, and the enterprise support organisation is slower than a small vendor's.

Mailjet

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.

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.

Pricing compared

Mailgun

Volume-metered on emails sent, with four tiers that differ mainly in included volume, log retention, inbound route allowance, and dedicated IP availability. Email validation is metered separately.

  • Free$0
  • BasicFrom $15
  • Foundation$35
  • Scale$90
  • CustomQuoted

Modelled at this directory's three reference points, Mailgun is mid-market on price and top of the category on inbound capability. A product with 1,000 users receiving three emails each sends 3,000 a month and fits inside Basic at $15, or the free tier if the daily cap allows. Ten thousand users at three emails each is 30,000 sends, still inside Basic at $15 but far better served by Foundation at $35 for the log retention and the inbound routes. Fifty thousand users at three emails each is 150,000 sends, which is Scale at $90 plus roughly $55 of overage, about $145 a month. That sits between Resend at around $80 and Postmark at around $199 for the same volume, and it is roughly ten times Amazon SES. What separates Mailgun from the cheaper options is inbound routing with rules rather than a single webhook, and validation from the same vendor. What separates it from the more expensive ones is that Postmark keeps a year of full message content where Mailgun keeps 30 days of events. Buy Mailgun for inbound; buy something else if outbound is all you do.

Mailjet

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.

  • Free$0
  • Starter$9
  • Essential$17
  • Premium$27
  • CustomQuoted

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.

Editorial verdict on each

Mailgun

Mailgun is the right purchase when your application receives email as well as sending it. The routing engine, with pattern matching, priority ordering, and forward, store, and post actions, is meaningfully better than the single inbound webhook every competitor offers, and having address validation on the same account removes a whole separate vendor from the list-hygiene problem. The EU sending region is a real advantage for European buyers. The problem is the retention ladder: one day of logs on Basic is not a debugging surface, five days on Foundation is barely one, and only Scale at $90 gets you the 30 days that a support team actually needs. Price it as Foundation or Scale from the start and the value looks reasonable, sitting between Resend and Postmark at around $145 for 150,000 messages a month. Price it as the $15 Basic plan and you will be disappointed the first time a customer asks about an email from last week. If you only send outbound mail, Resend is a better product; if you receive mail, Mailgun is still the one to buy.

Read the full Mailgun profile

Mailjet

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.

Read the full Mailjet profile

Mailgun profile last reviewed 2026-08-22; Mailjet last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.