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Postmark

Transactional-only sender with the best-policed shared IP pool in the category.

postmarkapp.compostmarkapp.com/developer
Overall in email apis
1of 13 · score 76.5
Data coverage
96%
24 of 25 fields sourced

Best for

  • •Password resets, receipts and anything a support ticket follows
  • •Cold sending domains with no reputation to lean on
  • •Teams who need 45 days of searchable history

Strong on

  • +Shared pool quality 5 1/13
  • +React Email / MJML mjml, handlebars 1/13
  • +llms.txt docs Yes 1/13
  • +BIMI Yes 1/11
  • +Log retention 45d 1/10
  • +DKIM/DMARC friction 2 2/13

Weak on

  • −Free tier 100 emails/mo 13/13
    Better: Brevo: 9,000 emails/mo
  • −Price / 1k emails $1.5/1k 9/12
    Better: Amazon SES: $0.1/1k
  • −Data residency us 9/13
    Better: Amazon SES: us, eu, au, apac, sa, ca
  • −Dedicated IP $50/mo 5/7
    Better: Amazon SES: $24.95/mo

vs Resend

  • •Ahead on Log retention: 45d vs 3d
  • •Ahead on Shared pool quality: 5 vs 4
  • •Behind on Price / 1k emails: $1.5/1k vs $0.4/1k
  • •Behind on GA year: 2010 vs 2023

How Postmark scores among 13 email apis24 of 25 fields known

Features10

Time to first send
4h
8/13
Leader: Resend · 10min
Product scope
transactional-first
7/13
Leader: Loops · marketing-first
Inbound parsing1st
Yes
1/13
postmarkapp.com · 2026-05-20
Event webhooks
delivered, opened, clicked, bounced, complained, unsubscribed, inbound
6/13
Leader: Amazon SES · delivered, opened, clicked, bounced, complained, deferred, unsubscribed, inbound
postmarkapp.com · 2026-05-20
Hosted templates1st
visual-editor
1/13
React Email / MJML1st
mjml, handlebars
1/13
Log retention1st
45d
1/10
Throughput ceiling
—
Multi-domain sending1st
Yes
1/13
Data residency
us
9/13
Leader: Amazon SES · us, eu, au, apac, sa, ca

Deliverability6

Shared pool quality1st
5
1/13
IP warmup1st
Yes
1/13
DKIM/DMARC friction2nd
2
2/13
Leader: Resend · 1
BIMI1st
Yes
1/11
Suppression list1st
Yes
1/13
Bounce handling1st
Yes
1/13

Pricing4

Price / 1k emails
$1.5/1k
9/12
Leader: Amazon SES · $0.1/1k
postmarkapp.com · 2026-05-20
Free tier
100 emails/mo
13/13
Leader: Brevo · 9,000 emails/mo
postmarkapp.com · 2026-11-06
Dedicated IP
$50/mo
5/7
Leader: Amazon SES · $24.95/mo
postmarkapp.com · 2026-11-06
Pricing model
volume-tiers
5/13
Leader: Amazon SES · pay-as-you-go

Agentic2

MCP server
Partial
8/13
Leader: Resend · Yes
llms.txt docs1st
Yes
1/13
postmarkapp.com · 2026-11-07

Traction1

Funding
acquired
5/13
Leader: Amazon SES · subsidiary

Positioning1

Positioning
"Your emails, delivered." Sells discipline rather than features, and unusually, the claim matches the product.

Timeline1

GA year
2010
11/13
Leader: Resend · 2023

Alternatives8

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Sources4