Compare
PostMTA Hosted vs Postmark
Postmark excels at transactional SaaS — PostMTA Hosted is for high-volume enterprise senders who need the full MTA.
| Capability | PostMTA Hosted | Postmark |
|---|---|---|
| Target | Enterprise / ESP / bank metal | Transactional SaaS |
| Volume | Millions+ with shaping | Tiered message caps |
| Dedicated IP | Native multi-IP egress | Add-on per server |
| Policy | Lua render + epoch apply | No MTA access |
| Inbound | Out of scope (honest) | Inbound processing |
Where PMH is the wrong choice
If you already have deep operational muscle with Postmark, do not rip and replace for the sake of it. PostMTA Hosted shines when the buyer needs managed control plane + smoke gates + verified From defaults. For pure send-and-forget transactional already covered by your incumbent, stay.
Migration timeline
- Week 1 — appliance bring-up + smoke-prod green.
- Week 2 — verified domains + credits ledger seeded.
- Week 3 — phased traffic at 1%, 10%, 50%, 100%.
- Week 4 — decommission Postmark.
Operators: see docs/getting-startedand docs/operate/PRODUCTION for the appliance runbook.