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Mailtruss vs Postmark.
Two email APIs for application mail. Here is what each charges and offers, using Postmark's own published prices, and the cases where Postmark is the better choice.
Postmark's figures were copied from postmarkapp.com on 2026-11-15. Prices change, so check that page before you decide. Mailtruss is not affiliated with Postmark.
What each costs
| Volume | Mailtruss | Postmark |
|---|---|---|
| About 10,000 emails a month | $9 (Starter, includes 25,000) | $15 (Basic) or $16.50 (Pro), each including 10,000 |
| More than 10,000 a month | $9 up to 25,000, then $29 up to 100,000 | Extra emails are $1.80 per 1,000 (Basic) or $1.30 per 1,000 (Pro). Use Postmark's own calculator for your volume. |
Postmark's pricing page states its entry plans at 10,000 emails and calculates other volumes with its own tool, so only the figures the page states are shown here. At 10,000 emails a month Mailtruss costs less and includes more (25,000). Mailtruss prices are on the pricing page.
Limits and features
| Mailtruss | Postmark | |
|---|---|---|
| Free plan | 3,000 emails a month, 100 a day | 100 emails a month; no overages are allowed on the free plan |
| Sending domains | 1, 3, 10, 50 (Free, Starter, Pro, Business) | 5 on Basic, 10 on Pro |
| Message history kept | 7, 30, 60 or 90 days by plan (Free to Business) | 45 days on Basic; 45 days by default, customizable up to 365 days on Pro |
| Inbound email | Yes, on every plan | Listed on Pro ("Inbound email processing") |
| Past the monthly limit | Sending stops at the limit; nothing is billed beyond your plan | Paid plans keep sending; extra emails are billed at the rates above |
| Dedicated IPs | Not available | Available from $50 a month per IP, for senders of 300,000 emails a month or more |
Where Postmark is the better choice
- You need to keep message history longer than Mailtruss's longest window, or to choose the length yourself.
- You want a dedicated IP address.
- You want a service with a long public track record. Mailtruss launched in November 2026.
Where Mailtruss fits
- You want a free plan big enough to build on: 3,000 emails a month, against 100.
- Every message has a recorded timeline, and failures are explained in plain language with whether a retry is safe. See delivery errors.
- Every plan has every feature, including inbound email. Plans differ only in volume, sending domains and API keys.
- Client libraries for Node.js, Python, Go, PHP, Ruby, Java and .NET, an OpenAPI document, and an MCP server. See send email by language.
Common questions
- Is Mailtruss cheaper than Postmark?
- At about 10,000 emails a month, yes: $9 on Mailtruss Starter, which includes 25,000, against $15 for Postmark Basic or $16.50 for Pro, each including 10,000. Postmark's page calculates other volumes with its own tool, so check it for your volume. These are Postmark's published prices on 2026-11-15.
- How do the free plans compare?
- Mailtruss's free plan has 3,000 emails a month (100 a day). Postmark's free plan has 100 emails a month, and no overages are allowed on the free plan.
- What does Postmark have that Mailtruss does not?
- Dedicated IP addresses, available from $50 a month per IP, for senders of 300,000 emails a month or more, and message history you can set up to 365 days on Pro. Mailtruss keeps history for 7 to 90 days depending on the plan.
Switching
A send is one POST /api/v1/emails with from, to, subject and html or text. Sending lists every field and Domains shows the DNS records to publish. Start free and send a test in test mode before you change anything.