Features
| Mektup | Postmark | |
|---|---|---|
| Transactional sending by API and SMTP | Yes | Yes |
| Incoming mail | Stored in mailboxes; webhook, REST API, IMAP | JSON webhook on Pro and Platform |
| Webmail and mail apps | Yes | No |
| Broadcast streams | No | Yes |
| Free plan | No | 100 emails a month |
Price
| Emails a month | Mektup Starter | Postmark Pro (with inbound) |
|---|---|---|
| 10,000 | $20 | $16.50 |
| 50,000 | $20 | about $68.50 |
From each company's pricing page on 23 October 2026.
When to choose which
Postmark if you send transactional mail at low volume and only need inbound mail as data. Mektup from around 15,000 emails a month on, or as soon as replies need a mailbox that people or agents work in.