Pricing compared.
Postmark’s paid plans start at 10,000 emails a month: Basic for $15 (extra emails $1.80 per 1,000), Pro for $16.50 ($1.30 per 1,000) and Platform for $18 ($1.20 per 1,000). Its free developer plan includes 100 emails a month. For 50,000 emails, Basic costs $55 and Pro $60.50. Postmark has no 250,000 tier; its Basic plan with 300,000 emails costs $245.
Mailumi Free includes 3,000 emails a month. Pro includes 50,000 emails for $20 and Scale 250,000 emails for $80, with extra emails at $1.00 and $0.80 per 1,000.
Inbound included.
Postmark includes inbound email processing on its Pro and Platform plans, not on Basic. Mailumi includes receiving on every plan, with signed JSON webhooks, recipient filters and automatic retries.
Built for transactional email.
Like Postmark, Mailumi keeps product email and marketing apart: transactional email goes through the API, announcements through Campaigns. Both use your verified domain with DKIM.
Mailumi vs Postmark at a glance
| Mailumi | Postmark | |
|---|---|---|
| Free plan | 3,000 emails/month | 100 emails/month |
| Entry paid plan | $20 for 50,000 emails (Pro) | $15 for 10,000 emails (Basic) |
| 50,000 emails/month | $20 (Pro) | $55 (Basic 50,000) |
| 250,000 emails/month | $80 (Scale, included) | $245 (Basic 300,000, no 250,000 tier) |
| Extra emails | $1.00 (Pro) or $0.80 (Scale) per 1,000 | $1.80 (Basic), $1.30 (Pro) or $1.20 (Platform) per 1,000 |
| Domains | 5, 10 or 100 | 5 (Basic), 10 (Pro) or unlimited (Platform) |
| Inbound email | Every plan | Pro and Platform |
| Templates | Included, with {{variables}} | Included |
| Where data is stored | EU on every plan | United States |
Competitor prices from their public pricing pages, checked 7 October 2026. Monthly prices in USD, excluding taxes. Totals with extra emails use each provider’s published overage rate.
Postmark alternative: common questions
- Is Postmark free?
- Postmark’s free developer plan includes 100 emails per month. Mailumi Free includes 3,000 emails per month.
- Is Mailumi cheaper than Postmark?
- At the same volume, yes: 50,000 emails a month cost $20 on Mailumi Pro and $55 on Postmark Basic, and 250,000 emails cost $80 on Mailumi Scale and at least $245 on Postmark. Between 3,000 and 10,000 emails a month, Postmark Basic costs $15 and Mailumi Pro $20. Prices checked 7 October 2026.
- How do I switch from Postmark?
- Verify your domain in Mailumi, then map From, To, Subject, HtmlBody and TextBody to from, to, subject, html and text in a POST to /api/v1/emails. The migration guide has the full mapping.
- Does Mailumi separate transactional and marketing email?
- Yes. Product email goes through the API and announcements through Campaigns, each from your verified domain.
Sources
Sources checked . Third-party features and prices may change.