What the evidence answers

A reading of reviewed official documentation for Mailjet and Postmark. It is not a hands-on test, a ranking or a recommendation of one product.

Price

  • Mailjet From $9/mo
    • Free: no subscription charge
    • Starter: $9.00 monthly
    • Essential: $19.00 monthly
    • Premium: $29.00 monthly
    • Custom: 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
Mailjet Free: 6,000 emails per monthStarter: 8,000 emails per monthEssential: 15,000 emails per monthPremium: 15,000 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
Webhooks and events
Mailjet APIs, SMTP relay and webhooks on Free and paid plans.
Postmark Inbound email is converted to JSON and posted to your webhook URL.Pro: Inbound email processing includedPlatform: Inbound email processing included
Dedicated IP
Mailjet Premium: available on request from the 100,000-send tier.Custom: One dedicated IP, with the option to buy more
Postmark From USD 50 a month per IP, for accounts sending 300,000 or more emails a month on Pro or higher.
Support
Mailjet Phone and chat support start from the 50k plans.Free: Online support in the first month onlyStarter: Online supportPremium: Priority support
Postmark Support requests are handled by the customer success team through support tickets.
Overage charges
Mailjet You can keep sending after the plan's emails run out; extra emails are billed per 1,000, at a price the page text does not show.
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

  • Mailjet Unused emails do not roll over; they expire at the end of each billing cycle.
  • 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.

Documented for one product only, shown in the table below: Postmark: sender domains and log retention.

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

  • Ask Mailjet about sender domains and log retention; our sources do not establish them yet.
Documented scope and limits; unverified dimensions remain unknown.
RequirementMailjetPostmark
Pricing
Who it is for
Email API, SMTP relay and webhooks, sold in plans that also cover marketing contacts and an email editor.

Verified Oct 11, 2026 · Mailjet: 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
Unused emails do not roll over; they expire at the end of each billing cycle.

Verified Oct 11, 2026 · Mailjet: 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 6,000 emails per month
  • Starter 8,000 emails per month
  • Essential 15,000 emails per month
  • Premium 15,000 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 domainsNot verified
  • Free 10 custom sending domains
  • Basic 5 custom sending domains
  • Pro 10 custom sending domains
  • Platform Unlimited custom sending domains
Log retentionNot verified
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
APIs, SMTP relay and webhooks on Free and paid plans.

Verified Oct 11, 2026 · Mailjet: 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
Premium: available on request from the 100,000-send tier.

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

  • Custom One dedicated IP, with the option to buy more
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
Phone and chat support start from the 50k plans.

The page does not say which plan names qualify.

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

  • Free Online support in the first month only
  • Starter Online support
  • Premium Priority 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
You can keep sending after the plan's emails run out; extra emails are billed per 1,000, at a price the page text does not show.

Verified Oct 11, 2026 · Mailjet: 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

No daily sending limit.

Starting tier; unlimited emails per day.

Not listed on the Basic card.

Choose two or three products.