Transactional email APIs · Comparison
Mailgun vs Postmark
2 products compared side by side: what you pay for with each one first, then the five access facts, entry prices, recorded plan limits and the bottom line of each review. The evidence note under the table says how each product was checked.
Side by side
| Metric | Mailgun | Postmark |
|---|---|---|
| What you're paying for | Compliance includedSOC 2 Type II and ISO 27001 for Mailgun itself, US or EU sending from one account, and SAML SSO included at $90. | Saves engineering timeInbound email processing and up to 365 days of message history from $16.50 a month, so you do not build mail parsing or log storage yourself. |
| Overall score | 7.5Best | 5.8 |
| Free option | Free plan | Free plan |
| Card to start | –Not measured | No card needed |
| Getting access | Self-serve | Self-serve |
| Starter priceCheapest paid plan | $15/mo | $15/mo |
| Pricing model | Tiered | Usage-based |
| Pricing page | Public prices | Public prices |
| Free plan | 100 a day, 1 user | 100/mo (testing) |
| Price for 50,000 emails/mo | $35 (Foundation) | $66–$87 at listed overage rates |
| Retention on the entry paid plan | 1 day of logs (Basic) | 45 days (up to 365 on Pro) |
| SOC 2 report | Type II, plus ISO 27001 | Data center's, under NDA |
| EU option | US or EU sending region | No; US hosting |
| SSO | SAML on Scale ($90) | Not listed |
| HIPAA BAA | Not mentioned | Not mentioned |
| Bottom line | From its public pages, Mailgun is the most complete compliance package of the three, with an EU sending region and SSO on its $90 plan. On smaller plans, plan around short log retention. | From its public pages, Postmark is the pick when inbound email and long message history matter more than price at volume. Check whether your security reviews accept a data-center SOC report. |
Evidence: Mailgun: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run; Postmark: facts checked 2026-10-15 from its public sign-up and pricing pages, no completed hands-on run. Prices in USD as listed, excluding tax. "–" means not recorded.
When to pick each
In the words of each review, with the date its facts were checked.
From our Mailgun review
Checked Oct 15, 2026- Pick Mailgun when
- You need a SOC 2 report of the vendor’s own, EU sending or SSO.
- Pick Postmark when
- You need inbound processing and message history up to 365 days.
From our Postmark review
Checked Oct 15, 2026- Pick Postmark when
- You send around 10,000 a month and want inbound processing and long history at $16.50.
- Pick Mailgun when
- You need an EU sending region, ISO 27001 or SAML SSO.
Entry price
Baseline: each product's cheapest paid plan, per month. Included usage differs, so read the line under each price.
- MailgunBasic$15/mo10,000 emails/mo, then $1.80 per 1,000
- No daily limit
- 1 custom domain
- 1-day log retention
- PostmarkBasic$15/mo10,000 emails/mo, then $1.80 per 1,000
- 45-day retention
- 5 custom domains
- Up to 4 users
- Unlimited emails per day
Prices as listed on each pricing page, in USD per month, excluding tax. Observed: Mailgun 2026-10-15, Postmark 2026-10-15.
Which one fits
- If you need to start today without a sales call
- MailgunSelf-serve sign-up; the highest score of the 2 self-serve products here (7.5/10).
- If you want to try it without entering a card
- PostmarkFree plan, no card needed; scored 5.8/10.
- Highest overall score
- Mailgun7.5/10 (Good). The review shows the score breakdown and the run behind it.
Picked by fixed rules from the table above, not by hand. How we score
Full reviews
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