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

Documented scope and limits; unverified dimensions remain unknown.
RequirementMailgunPostmark
Pricing
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
  • Free 100 emails per day
  • Basic 10,000 emails per month
  • Foundation 50,000 emails per month
  • Scale 100,000 emails per month
Unused emails do not roll over to the next billing period.

Verified Oct 11, 2026 · Postmark: official product and plan documentation

  • Free 100 emails per month
  • Basic 10,000 emails per month
  • Pro 10,000 emails per month
  • Platform 10,000 emails per month
Sender domains
  • Free 1 custom sending domain
  • Basic 1 custom sending domain
  • Foundation 1,000 custom sending domains
  • Scale 1,000 custom sending domains
  • Free 10 custom sending domains
  • Basic 5 custom sending domains
  • Pro 10 custom sending domains
  • Platform Unlimited custom sending domains
Log retention
  • Free 1 day of logs
  • Basic 1 day of logs
  • Foundation 5 days of logs
  • Scale 30 days of logs
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

  • Basic 45 days
  • Pro Customizable up to 365 days; 45 days by default
  • Platform Customizable up to 365 days; 45 days by default
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

  • Pro Inbound email processing included
  • Platform Inbound email processing included
Dedicated IP
Extra dedicated IPs cost USD 59 per IP a month.

Verified Oct 11, 2026 · Mailgun: official product and plan documentation

  • Foundation Available from the 50,000-email tier; one IP included from 100,000 emails a month
  • Scale One dedicated IP included, plus dedicated IP pools
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

  • Free Ticket support
  • Scale Live phone and chat support
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

  • Free No overages are allowed on Free.
Coverage note

Starting allowance.

Starting tier; unlimited emails per day.

Not listed on the Basic card.

Choose two or three products.