Postmark vs Sendmarc
Postmark
postmarkapp.com
Sendmarc
sendmarc.comSide by side
| Figure | Postmark | Sendmarc |
|---|---|---|
| Price from | $5/mo | — |
| Free plan | Yes | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 8 | 4 |
| Spec score · Email Deliverability Software | 8.7 (#6) | 8.1 (#13) |
| Company history | Postmark says it has delivered billions of emails since 2010. | Sendmarc says it was founded by Sam Hutchinson, Keith Thompson, and Sacha Matulovich; it does not state a founding year on the page. |
| Support | Postmark offers support by email, live chat, and one-on-one calls and reports a 95% customer happiness rating. | The pricing page lists knowledgebase, alert management, email support, and phone and remote support among support features. |
| What it does | Postmark delivers and tracks application email as a replacement for SMTP or Sendmail. | Sendmarc is a hosted DMARC platform for implementing, monitoring and enforcing email authentication against spoofing and phishing. |
Plans
Postmark
- FreeFree
- Basic$15 a month
- Pro$16.50 a month
- Platform$18 a month
- Custom activity retention$5 a month
- DMARC monitoring$14 a month
- Dedicated IP$50 a month
- High-volume plansPriced on request
Sendmarc
- Free TrialFree
- Enterprise & GovernmentPriced on request
- Microsoft, Google, & Yahoo CompliancePriced on request
- PremiumPriced on request
In their own words
Postmark
Postmark delivers and tracks application email as an alternative to SMTP or Sendmail. It separates transactional and broadcast messages into different Message Streams and IP infrastructure. Developers can send through REST API, SMTP, or multi-region SMTP routing, with official libraries for Node.js, Python, Rails, Ruby, PHP, and.NET. Inbound messages can be converted to JSON and sent to a webhook URL. Tracking includes delivery, bounces, spam, opens, and links, with event webhooks. Editable responsive templates cover transactional messages such as password resets, receipts, and invitations. The free Developer plan costs nothing, provides 100 emails per month, permits no overages, and does not expire. Basic starts at $15 a month for 10,000 emails per month; extra emails cost $1.80 per 1,000 and are calculated at the end of the billing cycle. Unused emails do not roll over. Postmark lists API and web access. Its iOS app was sunset in June 2025 and is no longer supported.