Transactional Email API
Best Postmark Alternatives & Open-Source Competitors in 1970
Postmark is priced as per-email volume, no overage surprises, starting at $15/mo (10,000 emails). Here are 3 alternatives, with their pricing, self-hosting effort and trade-offs.
Why teams move away from Postmark
- No production free tier at all
- Almost no marketing campaign tooling
- Per-email cost is high next to Amazon SES or Resend at volume
Postmark alternatives at a glance
| Tool | Licence | Starting price | Self-hosting | Stars |
|---|---|---|---|---|
| Postmark | Proprietary | $15/mo (10,000 emails) | Not available | N/A |
| Resend | Proprietary | $20/mo (Pro, 50,000 emails) | Not available | N/A |
| Twilio SendGrid | Proprietary | $19.95/mo (Essentials, 50,000 emails) | Not available | N/A |
| Amazon SES | Proprietary | $0.10 per 1,000 emails | Not available | N/A |
The alternatives in detail
Resend
Per-email volume, flat monthly plans
Proprietary
- Starting price
- $20/mo (Pro, 50,000 emails)
- Free tier
- Free 3,000 emails/mo (100/day), 1 domain
- Self-hosting
- Not available
Pros
- Clean REST API with React Email templates and SDKs for every major language
- Deliverability dashboard with bounces, complaints and suppression lists in one view
- Flat plans that do not charge per seat or per teammate
Cons
- No self-hosting, so sending depends on a third party
- Much less marketing automation than SendGrid or Mailchimp
- Per-email cost at high volume is several times Amazon SES
Twilio SendGrid
Per-email plan, marketing features as add-ons
Proprietary
- Starting price
- $19.95/mo (Essentials, 50,000 emails)
- Free tier
- Free 100 emails/day forever
- Self-hosting
- Not available
Pros
- Delivery infrastructure and IP reputation built over more than a decade of volume
- Marketing campaigns, templates and transactional mail under one account
- Extensive documentation, webhooks and legacy SMTP support
Cons
- Feature tiers and email volumes are mixed together, which makes upgrading confusing
- Account reviews can restrict sending at short notice
- Priority deliverability support only comes with the expensive plans
Amazon SES
Pay-as-you-go per 1,000 emails
Proprietary
- Starting price
- $0.10 per 1,000 emails
- Free tier
- 3,000 message charges/mo for the first 12 months on a new AWS account
- Self-hosting
- Not available
Pros
- The lowest per-email price of any major provider
- Scales to millions of messages with regions, dedicated IPs and reputation dashboards
- Wires into IAM, CloudWatch and the rest of AWS without extra glue
Cons
- Onboarding is console-and-DNS first: leaving the sandbox takes setup and a support request
- Deliverability tooling is basic compared with SendGrid or Postmark
- Billing arrives as one line in a larger AWS invoice, which is easy to lose track of
Postmark alternatives: FAQ
Why do teams look for Postmark alternatives?
The most common reasons are: no production free tier at all; almost no marketing campaign tooling; per-email cost is high next to Amazon SES or Resend at volume.
Is there a free alternative to Postmark?
Resend: Free 3,000 emails/mo (100/day), 1 domain. Twilio SendGrid: Free 100 emails/day forever. Amazon SES: 3,000 message charges/mo for the first 12 months on a new AWS account.