head to head
Postmark vs MailerSend
Deliverability-first transactional email versus API plus drag-and-drop template builder.
Side by side
| Feature | Postmark | MailerSend |
|---|---|---|
| Tagline | Transactional-only, fast and well-delivered. | Modern transactional API with a clean UI. |
| Free tier | 100/mo developer plan | 500/mo permanent |
| Starts at | $15/mo for 10,000 emails | $7/mo for 5,000 emails |
| Pricing model | tiered | tiered |
| API | Yes | Yes |
| SMTP | Yes | Yes |
| SDKs | node, python, go, ruby, php, java, elixir, rust, dotnet | node, python, go, ruby, php |
| Templates | rich | rich |
| React Email | No | No |
| Webhooks | Yes | Yes |
| Inbound | Yes | Yes |
| Multi-tenant | Yes | Yes |
| Idempotency | No | No |
| Dedicated IP | Yes | Yes |
| Deliverability | Strong transactional reputation with separate streams for transactional and broadcast traffic, which helps protect sender reputation. | Good and steadily improving; reputation managed via dedicated IP options on paid plans. |
| DX score | 9/10 | 8/10 |
| Best for | Teams where password resets, receipts, and magic links absolutely cannot miss the inbox. | Teams that want both API and visual template editing. |
Postmark
pros
- ›Transactional-only routing and strong operational history
- ›Streams cleanly separate transactional and broadcast
- ›Free DMARC monitoring product (dmarc.postmarkapp.com)
- ›Retains full message content and metadata for 45 days for debugging
cons
- ›No idempotency keys
- ›Pricing per email is higher than SES, Mailgun, or SMTP2GO
- ›No drag-and-drop template builder
- ›Marketing automation is intentionally absent
MailerSend
pros
- ›Drag-and-drop templates plus API
- ›Inbound routing supported
- ›Sub-accounts for agencies
cons
- ›Smaller SDK footprint than SendGrid
- ›Brand and ecosystem less recognized than older providers