Documentation-based comparison
Mailgun versus Postmark
Compare documented scope and conditions. Unknowns remain unknown; different billing units do not establish a cost winner.
What the evidence answers
A reading of reviewed official documentation for Mailgun and Postmark. It is not a hands-on test, a ranking or a recommendation of one product.
Price
- Mailgun From $15/mo
- Free: no subscription charge
- Basic: $15.00 monthly
- Foundation: $35.00 monthly
- Scale: $90.00 monthly
- Enterprise: Vendor quotation required
- Postmark From $15/mo
- Free: no subscription charge
- Basic: $15.00 monthly
- Pro: $16.50 monthly
- Platform: $18.00 monthly
- High volume: Vendor quotation required
Both list prices on the same basis. Compare what each plan includes; the lower amount alone does not make the better choice.
Documented for both
- Sending volume
- Mailgun Free: 100 emails per dayBasic: 10,000 emails per monthFoundation: 50,000 emails per monthScale: 100,000 emails per month
- Postmark Unused emails do not roll over to the next billing period.Free: 100 emails per monthBasic: 10,000 emails per monthPro: 10,000 emails per monthPlatform: 10,000 emails per month
- Sender domains
- Mailgun Free: 1 custom sending domainBasic: 1 custom sending domainFoundation: 1,000 custom sending domainsScale: 1,000 custom sending domains
- Postmark Free: 10 custom sending domainsBasic: 5 custom sending domainsPro: 10 custom sending domainsPlatform: Unlimited custom sending domains
- Log retention
- Mailgun Free: 1 day of logsBasic: 1 day of logsFoundation: 5 days of logsScale: 30 days of logs
- Postmark Custom activity retention starts at USD 5 a month and is only available on Pro plans or higher; statistics are kept indefinitely.Basic: 45 daysPro: Customizable up to 365 days; 45 days by defaultPlatform: Customizable up to 365 days; 45 days by default
- Webhooks and events
- Mailgun Tracking, analytics and webhooks are listed from the Free plan up.
- Postmark Inbound email is converted to JSON and posted to your webhook URL.Pro: Inbound email processing includedPlatform: Inbound email processing included
- Dedicated IP
- Mailgun Extra dedicated IPs cost USD 59 per IP a month.Foundation: Available from the 50,000-email tier; one IP included from 100,000 emails a monthScale: One dedicated IP included, plus dedicated IP pools
- Postmark From USD 50 a month per IP, for accounts sending 300,000 or more emails a month on Pro or higher.
- Support
- Mailgun Ticket, chat and phone support depend on the plan.Free: Ticket supportScale: Live phone and chat support
- Postmark Support requests are handled by the customer success team through support tickets.
- Overage charges
- Mailgun Extra emails are billed at the start of each month for the previous month, together with the plan fee.
- Postmark Extra emails on paid plans are calculated at the end of the billing cycle and added to the next month's charge.Free: No overages are allowed on Free.
Limits to check
- Mailgun Free and Basic allow 1 custom sending domain and 1 day of logs; Foundation raises this to 1,000 domains and 5 days, and Scale keeps 30 days.
- Postmark There is no tier between the free 100 emails a month and the 10,000-email paid tier.
Not verified yet
Every compared requirement has evidence for at least one.
Not verified means our reviewed sources do not establish it. It does not mean a product lacks the capability or that it costs nothing.
Next steps
| Requirement | Mailgun | Postmark |
|---|---|---|
| Pricing | From $15/mo | From $15/mo |
| Who it is for | Sends application email through an HTTP API or an SMTP endpoint. Verified Oct 11, 2026 · Mailgun: official product and plan documentation | Sends transactional email and keeps bulk or broadcast email on separate Message Streams. Verified Oct 11, 2026 · Postmark: official product and plan documentation |
| Coverage limits | Free and Basic allow 1 custom sending domain and 1 day of logs; Foundation raises this to 1,000 domains and 5 days, and Scale keeps 30 days. Verified Oct 11, 2026 · Mailgun: official product and plan documentation | There is no tier between the free 100 emails a month and the 10,000-email paid tier. Verified Oct 11, 2026 · Postmark: official product and plan documentation |
| Sending volume |
| Unused emails do not roll over to the next billing period. Verified Oct 11, 2026 · Postmark: official product and plan documentation
|
| Sender domains |
|
|
| Log retention |
| Custom activity retention starts at USD 5 a month and is only available on Pro plans or higher; statistics are kept indefinitely. Verified Oct 11, 2026 · Postmark: official product and plan documentation
|
| Webhooks and events | Tracking, analytics and webhooks are listed from the Free plan up. Basic, Foundation and Scale cards list them too. Verified Oct 11, 2026 · Mailgun: official product and plan documentation | Inbound email is converted to JSON and posted to your webhook URL. Verified Oct 11, 2026 · Postmark: official product and plan documentation
|
| Dedicated IP | Extra dedicated IPs cost USD 59 per IP a month. Verified Oct 11, 2026 · Mailgun: official product and plan documentation
| From USD 50 a month per IP, for accounts sending 300,000 or more emails a month on Pro or higher. Fully managed by Postmark. Verified Oct 11, 2026 · Postmark: official product and plan documentation |
| Support | Ticket, chat and phone support depend on the plan. Verified Oct 11, 2026 · Mailgun: official product and plan documentation
| Support requests are handled by the customer success team through support tickets. The pricing page lists no support level per plan. Verified Oct 11, 2026 · Postmark support centre |
| Overage charges | Extra emails are billed at the start of each month for the previous month, together with the plan fee. The first month is prorated. Verified Oct 11, 2026 · Mailgun: official product and plan documentation | Extra emails on paid plans are calculated at the end of the billing cycle and added to the next month's charge. Verified Oct 11, 2026 · Postmark: official product and plan documentation
|
| Coverage note | Starting allowance. | Starting tier; unlimited emails per day. Not listed on the Basic card. |