Documentation-based comparison
Postmark versus Resend
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 Postmark and Resend. 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
- Resend From $20/mo
- Free: no subscription charge
- Pro: $20.00 monthly
- Scale: $90.00 monthly
- Enterprise: 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
- Resend Paid plans have no daily cap, but received emails and every To, CC and BCC recipient count toward the monthly quota.Free: 3,000 emails per monthPro: 50,000 emails per monthScale: 100,000 emails per month
- Sender domains
- Postmark Free: 10 custom sending domainsBasic: 5 custom sending domainsPro: 10 custom sending domainsPlatform: Unlimited custom sending domains
- Resend Pro and Scale can add 100 more domains for USD 20 a month; Enterprise limits are set by contract.Free: 3 verified domainsPro: 10 domainsScale: 1,000 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
- Resend Free and Pro: 30-day data retention.Scale: 30 days
- Webhooks and events
- Postmark Inbound email is converted to JSON and posted to your webhook URL.Pro: Inbound email processing includedPlatform: Inbound email processing included
- Resend Pro: 5 webhook endpoints.Free: 1 webhook endpointScale: 10 webhook endpoints
- Dedicated IP
- Postmark From USD 50 a month per IP, for accounts sending 300,000 or more emails a month on Pro or higher.
- Resend USD 30 a month add-on on Scale for customers sending more than 3,000 emails a day; Resend warms up, monitors and scales the IP.
- Support
- Postmark Support requests are handled by the customer success team through support tickets.
- Resend Slack support and an urgent-response SLA are not included on Free or Pro.Free: Ticket supportScale: Dedicated Slack channelEnterprise: Guaranteed response times, a dedicated CSM and personalized migration 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.
- Resend Paid plans can keep sending past the monthly quota with pay-as-you-go, capped by default at 5 times the quota; sending then pauses until the next billing cycle.Pro: Pay-as-you-go is switched on in team settings and bills extra emails in buckets of 1,000; without it, Resend notifies you and offers an upgrade.
Limits to check
- Postmark There is no tier between the free 100 emails a month and the 10,000-email paid tier.
- Resend Every account starts at 10 API requests per second, whatever the plan; an increase goes through support.
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 | Postmark | Resend |
|---|---|---|
| Pricing | From $15/mo | From $20/mo |
| 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 | Sends application email, such as password resets and order confirmations, through the /emails API; marketing broadcasts use a separate API. Verified Oct 11, 2026 · Resend: official product and plan documentation |
| 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 | Every account starts at 10 API requests per second, whatever the plan; an increase goes through support. Verified Oct 11, 2026 · Resend help: account quotas and limits |
| Sending volume | Unused emails do not roll over to the next billing period. Verified Oct 11, 2026 · Postmark: official product and plan documentation
| Paid plans have no daily cap, but received emails and every To, CC and BCC recipient count toward the monthly quota. Verified Oct 11, 2026 · Resend help: account quotas and limits
|
| Sender domains |
| Pro and Scale can add 100 more domains for USD 20 a month; Enterprise limits are set by contract. Verified Oct 11, 2026 · Resend help: account quotas and limits
|
| 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
| Free and Pro: 30-day data retention. Verified Oct 11, 2026 · Resend: official product and plan documentation
|
| 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: 5 webhook endpoints. Verified Oct 11, 2026 · Resend: official product and plan documentation
|
| 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 | USD 30 a month add-on on Scale for customers sending more than 3,000 emails a day; Resend warms up, monitors and scales the IP. Verified Oct 11, 2026 · Resend: official product and plan documentation |
| 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 | Slack support and an urgent-response SLA are not included on Free or Pro. Verified Oct 11, 2026 · Resend: official product and plan documentation
|
| 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
| Paid plans can keep sending past the monthly quota with pay-as-you-go, capped by default at 5 times the quota; sending then pauses until the next billing cycle. Support can adjust the cap. Verified Oct 11, 2026 · Resend help: account quotas and limits
|
| Coverage note | Starting tier; unlimited emails per day. Not listed on the Basic card. | All webhook event types are available on every plan. |