Postmark

Postmark deliberately limits itself to transactional email. Streams keep transactional and broadcast traffic separated. The product emphasizes message activity retention, clear debugging, and volume pricing with no feature gates.

Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.

Against behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, Postmark covers event stream, the suppressions API, and multi-tenant support, and does not cover scheduling, operating track record, and best published rate per 1,000. Whether that gap matters depends on how central those are to the build.

• Scheduling: No
• Event stream: Yes
• Deliverability: Strong transactional reputation with separate streams for transactional and broadcast traffic, which helps protect sender reputation.
• Operating since: 2010
• Suppressions API: Yes
• Best published rate per 1,000: $1.50
• Multi-tenant: Yes
• Free tier: 100/mo developer plan
• Starts at: $15/mo for 10,000 emails

Strong transactional reputation with separate streams for transactional and broadcast traffic, which helps protect sender reputation.

Teams where password resets, receipts, and magic links absolutely cannot miss the inbox.

Marketing automation, abandoned-cart sequences, lifecycle nurturing.