Mailivery
Unlimited mailboxes against a shared warm-up pool, with testing and verification thrown in
Mailivery is an email warm-up and deliverability platform that connects unlimited mailboxes to a peer-to-peer network exchanging AI-generated conversations, and bundles blacklist monitoring, email verification credits, and inbox placement tests into flat monthly tiers metered by a shared daily warm-up email pool.
Overview
Mailivery's warming engine works the way the category's peer networks all do: your mailbox exchanges AI-generated conversations with real accounts in the network, those accounts open, reply, and pull messages out of spam and the Promotions tab, and providers read the engagement as evidence you belong in the Primary inbox. The company leans on two claims to stand out: the counterparties are real peer-to-peer accounts rather than a farm of synthetic inboxes, and the conversation content is AI-generated and customizable, down to templates, time zones, and signatures.
The pricing model is the more interesting differentiator. Where Warmbox, Warmup Inbox, and MailReach meter connected inboxes, Mailivery lets every plan connect unlimited mailboxes and instead meters a shared pool of daily warm-up emails (200 on Starter, 800 on Professional, 2,500 on Business) with per-mailbox caps and a limit on the simulated response rate. For an agency or outbound team spreading volume across many mailboxes, that flips the economics: ten lightly warmed mailboxes cost the same as two heavily warmed ones.
Around the warmer, Mailivery has accreted a light deliverability toolkit: blacklist monitoring across 70+ lists, a three-layer email verification feature with per-tier credits, inbox placement test credits, a spam-words checker, and team roles. None of these matches a dedicated tool (GlockApps for testing, a purpose-built verifier for list cleaning), but together they make Mailivery closer to a budget deliverability bundle than a single-purpose warmer. The company behind it, SourceIT Technologies, Inc., is a small Illinois-registered operation founded in 2020 that says it serves 1,000+ customers.
Best for
Agencies and outbound teams running many mailboxes at moderate warm-up volume who want one flat subscription to cover warming, basic blacklist monitoring, verification credits, and occasional placement tests instead of paying per inbox across several tools.
Not the right fit for
- Single-mailbox senders; a solo user cannot exploit the unlimited-mailbox model, and Warmbox's $15 Solo plan warms one inbox for half of Mailivery's Starter price.
- Teams that need serious diagnostics; the bundled placement tests and spam-words checker are shallow next to GlockApps' seed testing and DMARC analytics, and heavy testers will exhaust tier credits fast.
- High-volume list cleaners; verification credits top out at 2,000 a month on Business, a rounding error against a dedicated verifier for teams processing large prospect lists.
- Buyers wanting warm-up bundled with sending; sequencers like Instantly and Smartlead include warming with the campaign engine, removing the separate subscription entirely.
- Anyone uncomfortable with trial friction; the 7-day trial requires a credit card, so evaluation carries a cancellation chore competitors do not impose.
How it works
- 1
You connect mailboxes via OAuth or SMTP/IMAP; every plan allows unlimited connections, so the practical constraint is your plan's shared daily email pool and the per-mailbox daily cap (100 emails on Starter, 250 on higher tiers). Each mailbox gets its own warming schedule, volume ramp, and reply-rate setting within those limits.
- 2
The network then runs the engagement loop: Mailivery sends AI-generated conversation emails from your account to peer accounts, which open them, reply positively, mark them relevant, and rescue any that landed in spam or Promotions. Response rates are capped by tier (30 percent on Starter, 55 percent above), and sending patterns can be scheduled and randomized to mimic human cadence, including business hours and time zones.
- 3
Warm-up traffic is tagged and automatically sorted out of your working inbox, and the dashboard reports placement of warm-up mail (inbox, spam, Promotions), reputation trends per mailbox, and blacklist status across 70+ monitored lists. Verification credits let you clean prospect lists before a campaign, and placement test credits give a per-send snapshot of where a real message lands.
- 4
Teams get role-based access with 2 to 10 users depending on tier; an Enterprise arrangement with custom limits and API access is quoted directly. The intended rhythm is continuous: warm mailboxes before campaigns, keep maintenance warming running during them, verify lists before each send, and watch the blacklist monitors for regressions.
Feature breakdown
20 features in 5 modulesPeer-to-peer warming engine
The core reputation loop, run against what Mailivery emphasizes are real peer accounts.- Peer-to-peer network
- Warm-up conversations run against other real customer mailboxes and network accounts rather than a purely synthetic inbox farm, per Mailivery's positioning.
- AI-generated conversations
- Warm-up threads use AI-generated, varied text so exchanges do not carry a repeated template fingerprint filters could learn.
- Spam and Promotions rescue
- Network accounts move warm-up messages out of spam and the Promotions tab into Primary, the direct not-spam signal that retrains provider filters.
- Positive engagement signals
- Opens, replies, and marking messages as relevant accumulate on the sending account to build reputation with Gmail and Outlook.
- Automatic inbox cleanup
- Warm-up traffic is auto-read and sorted into folders so connected mailboxes stay usable for real correspondence.
Volume, pacing, and customization
The controls that shape how warming traffic looks to a provider.- Unlimited mailbox connections
- Every tier allows unlimited connected mailboxes; plans are metered by a shared daily email pool instead (200, 800, or 2,500 emails/day).
- Per-mailbox daily caps
- Individual mailboxes are capped at 100 warm-up emails/day on Starter and 250 on Professional and Business, keeping any one account's pattern plausible.
- Tiered response rates
- Simulated reply rates are capped at 30 percent on Starter and 55 percent on higher tiers; higher reply rates are a stronger, faster reputation signal.
- Scheduling and human cadence
- Sending windows, time zones, ramp-up curves, and volume randomization approximate a human correspondent rather than a metronome.
- Custom warm-up templates and signatures
- Teams can supply their own conversation templates and signatures so warming traffic resembles the language of their real sending.
Monitoring and testing
The bundled measurement layer, useful, but thinner than dedicated diagnostics tools.- Blacklist monitoring (70+ lists)
- Domains and IPs are checked against 70+ blocklists, with 2, 10, or 50 monitors by tier and alerts when a listing appears.
- Inbox placement tests
- Credit-metered tests (10, 30, or 100 per month by tier) report where a real message lands across providers, a spot-check rather than a full seed panel.
- Spam and reputation analytics
- Dashboards trend warm-up placement, spam rates, and sender reputation per mailbox over the warming period.
- Spam-words checker
- Flags phrasing in draft copy that correlates with content filtering before a campaign goes out.
List hygiene
Verification bundled in credit form rather than as a separate product.- Three-layer email verification
- Syntax, domain, and mailbox-level checks validate addresses before sending; bounces are the fastest way to undo a warmed reputation.
- Tiered verification credits
- 100, 500, or 2,000 verification credits per month by tier, sized for spot-cleaning outreach lists rather than bulk database hygiene.
Team and platform
Multi-user structure and the beginnings of a programmatic surface.- Role-based team access
- 2, 4, or 10 users by tier with role controls, enough for an agency pod to share one account safely.
- Provider-agnostic connections
- OAuth for Google and Microsoft plus SMTP/IMAP for other providers and sending infrastructure.
- API access for larger accounts
- Programmatic access is available on Enterprise arrangements; it is not part of the published self-serve tiers.
- Enterprise custom limits
- Custom daily pools, monitors, credits, and contractual terms are quoted directly for platforms and large teams.
Use cases
4 documentedCold-email agency running 20 client mailboxes
Each client needs two or three warmed senders, and per-inbox warmers would price the roster at several hundred dollars a month.
Unlimited connections on the Business plan spread a 2,500-email daily pool across the whole roster for $199 a month, with 50 blacklist monitors covering every client domain.
Outbound team rotating fresh domains
The team spins up new sending domains monthly and needs each warmed for three weeks before entering the rotation, without renegotiating a per-inbox bill every time.
New mailboxes connect at no marginal cost, ramp on their own schedule inside the shared pool, and retire from warming when they enter live sending.
Founder preparing a first outbound push
One person, two mailboxes, a scraped prospect list of uncertain quality, and no budget for a separate verifier and tester.
Starter covers warming both mailboxes, 100 verification credits clean the worst of the list, and 10 placement tests confirm the first sequences land before volume ramps.
RevOps lead standardizing deliverability practice
SDR mailboxes keep drifting into spam after heavy quarters, and nobody notices until reply rates crater.
Maintenance warming runs continuously on every SDR mailbox, blacklist monitors alert on listings, and the reputation dashboard gives an early-warning trend instead of a post-mortem.
Pricing
from $21.75/mo (Starter, billed annually; $29 monthly)Flat monthly tiers with unlimited connected mailboxes, metered by a shared daily warm-up email pool plus per-tier allotments of blacklist monitors, verification credits, and placement tests; 25 percent discount on annual billing.
| Plan | Price | Includes |
|---|---|---|
| Starter | $29 ($21.75 billed annually) per month |
|
| Professional | $79 ($59.25 billed annually) per month |
|
| Business | $199 ($149.25 billed annually) per month |
|
| Enterprise | Custom per month |
|
Billing notes
- Annual billing takes 25 percent off every tier; the quoted annual per-month figures ($21.75, $59.25, $149.25) are billed up front for the year.
- The 7-day free trial requires a credit card, so cancellation is on you if the product disappoints.
- Unlimited mailboxes is real but bounded: the shared daily pool is the true meter, and 200 emails/day on Starter warms only a handful of mailboxes at meaningful individual volume.
- Verification credits and placement tests do not accumulate meaningfully at lower tiers; teams that test or verify heavily should price a dedicated tool rather than upgrading tiers for credits.
Value assessment: Mailivery's per-dollar story is strongest exactly where per-inbox competitors are weakest: many mailboxes at moderate volume. $199 a month warming an agency's whole 20-mailbox roster, with blacklist monitoring and some verification thrown in, is genuinely cheap against per-inbox pricing at Warmup Inbox or MailReach. The story inverts for small setups: a solo sender pays $29 for capacity they cannot use, and the bundled testing and verification are conveniences, not substitutes for real tools. Price it by dividing your mailbox count into the daily pool; if the quotient looks generous, Mailivery is likely the value pick.
Strengths & limitations
Strengths
- Unlimited mailbox connections on every tier is a structural price advantage for agencies and multi-domain outbound teams over per-inbox competitors.
- The bundle is broad for the money: warming, 70+ list blacklist monitoring, verification credits, placement tests, and a spam-words checker under one flat subscription.
- Granular warming controls (schedules, time zones, ramp curves, custom templates, signatures) let traffic resemble a team's real correspondence.
- Tier-capped response rates up to 55 percent are at the high end of the category, and reply signals are the strongest reputation currency a warmer can generate.
- Team roles with up to 10 users make shared agency operation practical without credential sharing.
Limitations
- The shared daily pool quietly caps the unlimited-mailbox pitch; Starter's 200 emails/day cannot seriously warm more than a few mailboxes at once.
- Bundled diagnostics are shallow: placement tests are credit-metered spot checks, and there is no DMARC analytics or deep seed-panel reporting comparable to GlockApps.
- Verification tops out at 2,000 credits a month, too little for real list-hygiene workloads.
- API access is gated behind custom Enterprise arrangements rather than published self-serve tiers.
- Company transparency is thin: a small Illinois-registered entity with no published headcount, funding, or security attestations, which enterprise buyers will notice.
- As with every engagement network, artificial warming sits in a provider gray zone; Google and Microsoft periodically move against warming pools, a category risk Mailivery shares.
Head-to-head comparisons
4 alternativesMailivery vs Warmbox
from $15/mo (Solo, billed annually)Warmbox meters inboxes per tier; Mailivery sells unlimited inboxes against a shared daily pool. For one or two mailboxes Warmbox is cheaper and simpler; from roughly five mailboxes up, Mailivery's model wins on price and adds blacklist monitors, verification credits, and placement tests Warmbox lacks entirely.
Full Mailivery vs Warmbox comparisonMailivery vs Warmup Inbox
from $15/inbox/mo (Basic, billed annually at $180/yr)Warmup Inbox charges per inbox and rewards paying up with heavier daily volumes (to 1,000 emails/day per inbox) and 100+ list monitoring with delisting help; Mailivery spreads a shared pool across unlimited inboxes at a flat rate. High volume per mailbox favors Warmup Inbox; high mailbox count per dollar favors Mailivery.
Full Mailivery vs Warmup Inbox comparisonMailivery vs MailReach
from $25/mailbox/moMailReach is the more polished warmer with a stronger placement-testing story and a public methodology, priced per inbox; Mailivery is the volume buy with a broader budget bundle. Teams warming a few important mailboxes carefully lean MailReach; agencies warming many mailboxes cheaply lean Mailivery.
Full Mailivery vs MailReach comparisonMailivery vs GlockApps
from $59/mo (Essential, billed annually)These are complements, not substitutes: Mailivery builds reputation and includes light spot-check testing, while GlockApps offers deep seed testing, DMARC analytics, and monitoring with no warming at all. A serious program often runs Mailivery (or another warmer) for remediation and GlockApps for measurement.
Full Mailivery vs GlockApps comparisonImplementation & onboarding
- Setup time
- Minutes per mailbox via OAuth or SMTP/IMAP; expect 2 to 4 weeks of warming before a new domain is campaign-ready, with results Mailivery itself pegs at a couple of weeks to a month.
- Learning curve
- Low for default warming; moderate to use the pool wisely across many mailboxes, since per-mailbox caps, response rates, and ramp curves interact with the shared daily limit.
- Onboarding
- Self-serve signup with a credit-card trial; documentation and chat support rather than assigned onboarding.
- Migration notes
- No meaningful lock-in: disconnecting mailboxes ends the relationship, and only historical warming and monitoring data is lost. Workspace admins may need to approve the OAuth app or open SMTP/IMAP access.
Platform, API & security
- Platforms
- Web appAPI (Enterprise arrangements only)
- API
- API access exists for larger teams and platform partners but is not part of published self-serve plans; scope and limits are quoted case by case.
- Compliance
- GDPR-aligned processes (self-reported)
- Data residency
- Not publicly specified; the operating entity is registered in Illinois, US.
- SSO
- Not advertised; team access uses individual logins with roles.
- Security notes
- Warming requires standing send-and-read access to connected mailboxes via OAuth or stored SMTP credentials. No SOC 2 or equivalent attestation is published as of this review.
Support & resources
- Channels
- Live chatEmail support (accounts@mailivery.io)
- Documentation
- Help documentation plus a blog covering warm-up and deliverability practice.
- Community
- No dedicated user community; support is vendor-direct.
Company
- Founded
- 2020
- Headquarters
- Illinois, US (registered as SourceIT Technologies, Inc.)
- Ownership
- Privately held (SourceIT Technologies, Inc.)
- Founders
- Thibald Leonhard
- Employees
- Not disclosed (small team)
- Funding
- No external funding disclosed.
Timeline
- 2020Mailivery launches as a peer-to-peer email warm-up service.
- 2022Platform grows past its initial warming scope with blacklist monitoring and team features as the cold-email boom expands the category.
- 2024AI-generated conversation content and customizable templates become central to the warming engine as providers get better at fingerprinting templated warm-up text.
- 2025Verification credits and inbox placement tests round out the bundle, repositioning Mailivery as a budget deliverability suite rather than a bare warmer.
- 2026As of this review the company reports 1,000+ customers on an unlimited-mailbox, shared-pool pricing model across three self-serve tiers.
Integrations
- Gmail / Google Workspace (OAuth)
- Outlook / Microsoft 365 (OAuth)
- Any SMTP/IMAP provider
- API (Enterprise arrangements)
Frequently asked questions
10 questionsWhat does Mailivery do?
Mailivery warms email accounts by exchanging AI-generated conversations with a peer-to-peer network of real mailboxes that open, reply, and rescue messages from spam and Promotions, building the sender reputation providers use for inbox placement. It bundles blacklist monitoring, email verification credits, and inbox placement tests alongside the warmer.
How much does Mailivery cost?
Starter is $29/month ($21.75 on annual billing), Professional $79 ($59.25 annual), and Business $199 ($149.25 annual), with a custom Enterprise tier above that. All tiers allow unlimited mailboxes; what scales is the shared daily warm-up pool (200, 800, or 2,500 emails/day) plus monitors, credits, and users.
Does Mailivery really allow unlimited mailboxes?
Yes, connection count is uncapped on every tier, but the shared daily email pool is the real limit. On Starter's 200 emails/day, only a handful of mailboxes can warm at meaningful individual volume at once; the unlimited model pays off on Professional and Business where the pool is larger.
Is there a free trial?
Yes, 7 days, but a credit card is required up front, so you must cancel before the trial ends to avoid the first charge. There is no free plan.
How long until Mailivery improves deliverability?
Mailivery itself says results typically show within a couple of weeks to a month, which matches category norms: plan on 2 to 4 weeks of ramped warming before a new domain carries real campaign volume, and keep maintenance warming running afterward.
Does Mailivery use real inboxes or bots?
Mailivery emphasizes that warm-up runs against real peer-to-peer accounts rather than a purely synthetic farm. As with every warming network, that claim is not independently auditable, but real-account engagement is the mechanism the whole category depends on.
Does Mailivery include inbox placement testing?
Yes, as metered credits: 10 tests a month on Starter, 30 on Professional, 100 on Business. They are useful spot checks on where a real message lands, but they are not a substitute for a dedicated seed-testing and DMARC platform like GlockApps if measurement is a core requirement.
Does Mailivery verify email addresses?
Yes, a three-layer verification feature (syntax, domain, mailbox checks) is included with 100, 500, or 2,000 credits a month by tier. That is enough to spot-clean outreach lists; bulk list hygiene needs a dedicated verifier with volume pricing, such as MailerCheck.
Does Mailivery have an API?
Only on custom Enterprise arrangements; the published self-serve tiers do not include API access. Teams that need programmatic control should get scope and limits in writing from sales before committing.
Who runs Mailivery?
Mailivery is operated by SourceIT Technologies, Inc., a privately held company registered in Illinois, founded in 2020 by Thibald Leonhard. Headcount and funding are not disclosed; the company reports serving 1,000+ customers.
Editorial verdict
Mailivery is the volume buyer's warmer. The unlimited-mailbox, shared-pool model is a genuinely different price structure in a category that defaults to per-inbox metering, and for an agency or multi-domain outbound team it can cut the warming bill by half or more while adding blacklist monitoring and enough verification and testing credits to cover routine hygiene. The caveats are the mirror image: solo senders overpay for capacity they cannot use, the bundled diagnostics are spot checks rather than real measurement, and the company behind it is small and opaque. If your mailbox count is the problem, Mailivery is probably the answer; if depth of diagnostics or enterprise assurances are the problem, look elsewhere.
Written by the SaaSTracker editorial team. Awards, when shown, are judged against the published criteria in our methodology.