Looking for a Postmark alternative that's transactional-only and adds inbound?
One product instead of a transactional / broadcast split, over the outbound provider you choose. Postmark's two-product split is great when you need it; Flowmails is the single-product alternative when you don't.
Postmark is a great product — it's where most teams land the first time they need transactional email that "just works." But as your stack matures, the calculus often shifts: data residency requirements, predictable cost at higher volumes, and the desire to own the whole mail surface — inbox, route table, events and outbound — behind one API instead of three vendors.
Flowmails is what you ship when those are the things you've started to care about. It connects to your domain provider over OAuth and runs one shared mail worker for every tenant, so your inbox, outbox, and route table live in one place, scoped to your domain. There is no per-email fee on top of your provider's own pricing; the platform subscription is what you see on the /price page.
Postmark's free tier is 100 emails/month; paid starts at $15 / month for 10,000 emails, with separate pricing for broadcast. Flowmails Base is $0; Pro is $9.9 / month and Enterprise is $39.9 / month.
Postmark is hosted — sign up, verify sender signature, call the API. Flowmails connects your domain provider over OAuth and runs the shared mail worker for every tenant.
Postmark: teams that want a hosted ESP with both transactional and broadcast under the same account. Flowmails: teams that don't need broadcast or want it handled by a separate tool.
Postmark exposes an HTTP API and an SMTP relay. Flowmails is REST-only. SDK-wise, the surface areas are similar (send / receive / templates / stats).
Highlights
What Flowmails does differently
Data residency
Flowmails' own storage, scoped by domain id
Inbound parse
Yes
Broadcast / newsletters
No (transactional only)
Templates
Plain HTML / text in your code or dashboard
SMTP relay
No
Per-email pricing
No
Migration
How to migrate from Postmark to Flowmails
Confirm you only need transactional email
If your team uses Postmark's broadcast product for newsletters, keep it — Flowmails doesn't replace it. The migration only covers the transactional surface.
Connect the domain's provider
Same prerequisite: the zone must be on a supported routing provider. Flowmails provisions Email Routing on the zone and an outbound provider per domain.
Port templates and SDK calls
Postmark templates use the `{{variable}}` Mustache-style syntax — port them to either plain HTML in your Worker or a templating layer of your choice. SDK calls swap to Flowmails SDK calls.
FAQ
Common questions about switching from Postmark
Other alternatives