What the evidence answers

A reading of reviewed official documentation for Postmark and SMTP2GO. It is not a hands-on test, a ranking or a recommendation of one product.

Price

  • 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
  • SMTP2GO From $15/mo
    • Free: no subscription charge
    • Starter: $15.00 monthly
    • Starter: $150.00 annual ($12.50/mo equivalent)
    • Professional: $75.00 monthly
    • Professional: $750.00 annual ($62.50/mo equivalent)
    • Premier: 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
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
SMTP2GO Free: 1,000 emails per monthStarter: 10,000 emails per monthProfessional: 100,000 emails per monthPremier: More than 3,000,000 emails a month
Sender domains
Postmark Free: 10 custom sending domainsBasic: 5 custom sending domainsPro: 10 custom sending domainsPlatform: Unlimited custom sending domains
SMTP2GO SPF and DKIM are set up automatically for your sending domains.
Log retention
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
SMTP2GO Free: 5 days of email reportingStarter: 30 days of email reportingProfessional: 30 days of email reporting
Dedicated IP
Postmark From USD 50 a month per IP, for accounts sending 300,000 or more emails a month on Pro or higher.
SMTP2GO Professional: Dedicated IP address included
Support
Postmark Support requests are handled by the customer success team through support tickets.
SMTP2GO Starter: ticket, chat and phone support.Free: Ticket support; toll-free phone and live chat for the first 14 days onlyProfessional: Ticket, chat and phone support
Overage charges
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.
SMTP2GO Free: Extra emails are not permitted on Free.

Limits to check

  • Postmark There is no tier between the free 100 emails a month and the 10,000-email paid tier.
  • SMTP2GO The free plan is limited to 200 emails a day and does not allow extra emails.

Not verified yet

Every compared requirement has evidence for at least one.

Documented for one product only, shown in the table below: Postmark: webhooks and events.

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 SMTP2GO about webhooks and events; our sources do not establish it yet.
Documented scope and limits; unverified dimensions remain unknown.
RequirementPostmarkSMTP2GO
Pricing
Who it is for
Sends transactional email and keeps bulk or broadcast email on separate Message Streams.

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

Email delivery for transactional email from apps, everyday email from Outlook and marketing email with an unsubscribe link.

Verified Oct 11, 2026 · SMTP2GO homepage

Coverage limits
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

The free plan is limited to 200 emails a day and does not allow extra emails.

Verified Oct 11, 2026 · SMTP2GO pricing, loaded monthly plan cards

Sending volume
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
  • Free 1,000 emails per month
  • Starter 10,000 emails per month
  • Professional 100,000 emails per month
  • Premier More than 3,000,000 emails a month
Sender domains
  • Free 10 custom sending domains
  • Basic 5 custom sending domains
  • Pro 10 custom sending domains
  • Platform Unlimited custom sending domains
SPF and DKIM are set up automatically for your sending domains.

Verified Oct 11, 2026 · SMTP2GO homepage

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

  • Basic 45 days
  • Pro Customizable up to 365 days; 45 days by default
  • Platform Customizable up to 365 days; 45 days by default
  • Free 5 days of email reporting
  • Starter 30 days of email reporting
  • Professional 30 days of email reporting
Webhooks and events
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
Not verified
Dedicated IP
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

  • Professional Dedicated IP address included
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

Starter: ticket, chat and phone support.

Verified Oct 11, 2026 · SMTP2GO: official product and plan documentation

  • Free Ticket support; toll-free phone and live chat for the first 14 days only
  • Professional Ticket, chat and phone support
Overage charges
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.
  • Free Extra emails are not permitted on Free.
Coverage note

Starting tier; unlimited emails per day.

Not listed on the Basic card.

At the default volume shown.

Choose two or three products.