Pay for the platform. Your provider bills you for the email.
Three plans for the whole platform — a hosted inbox and outbox on your own domain, route tables, the REST API and SDK, and mail retention and storage. Flowmails never meters or marks up an outbound message: sending is billed by the provider you route that domain through.
Plans
Three tiers, each one covering the platform end to end.
Base
Get started with custom-domain email routing. A month of agent event log, one credential, ten durable waits — free forever, no card required.
- 30 days of agent event log
- 1 agent credential
- 10 concurrent durable waits
- 1 webhook endpoint
- Mail kept for 3 months
- 100 MB attachment storage
- 2 custom domains
- 2 custom route templates
- 1 API key
- Full routing capability: literal + catch-all
- Community support
- "Powered by Flowmails" badge shown
Pro
or $99 / year — save 17%
For founders running real production traffic on multiple domains — a quarter of agent event log, signed webhooks, longer retention, and no 'Powered by Flowmails' badge.
- 90 days of agent event log
- 5 agent credentials
- 50 concurrent durable waits
- 5 webhook endpoints
- Mail kept for 1 year
- 500 MB attachment storage
- 10 custom domains
- 10 route templates
- 5 API keys
- Inbound Parse → JSON
- Slack / Discord notifications
- SPF / DKIM / DMARC monitoring + monthly report
- Hide "Powered by Flowmails" badge
- Email support, 48h response
Enterprise
or $399 / year — save 17%
For teams operating at scale — a year of agent event log, the audit log you can read back, and the longest retention and storage windows.
- 365 days of agent event log
- 20 agent credentials
- 200 concurrent durable waits
- 20 webhook endpoints
- Mail kept for 3 years
- 2 GB attachment storage
- Audit log — read back in the dashboard
- Everything in Pro
- 50 custom domains
- 100 route templates + team sharing
- 20 API keys
- SPF / DKIM / DMARC weekly report + anomaly alerts
- Priority support, 8h response + Slack channel
- 99.9% uptime SLA
- SSO / SAML
Accepted payment methods
Gray items are on the roadmap but not yet shipped
What you actually pay for
We charge for the platform. Your sending provider charges you for the email.
A Flowmails subscription buys the platform layer — the parts that make a mailbox on your own domain usable from an agent. It does not buy outbound email. Sending is metered and billed by the provider you route that domain through, on your own account, at their rate. We never meter a message, bundle one into a plan, or mark it up.
Flowmails — the platform layer
One subscription, the same on every plan. This is the part the plan cards above price.
- The agent state Flowmails holds for you — event log, credentials, durable waits, webhook endpoints
- Your custom domains and route tables
- API keys
- A hosted inbox and outbox on your own domain
- The REST API, the SDK, the CLI and the agent surface
- Mail retention and attachment storage
- The dashboard, and onboarding over OAuth
Your provider — the email itself
You pick the outbound provider per domain. Their rates apply, they appear on their invoice, and there is no markup from us on top of them.
Cloudflare Email Sending
Their pricing- Outbound sending
- Needs Workers Paid — $5/month minimum per account
- Outbound included
- 3,000 emails a month, then $0.35 per 1,000
- Inbound routing
- Unlimited and free on Workers Free and Paid
Resend
Their pricing- Free tier
- 3,000 emails a month, capped at 100 a day
- Pro
- $20/month for 50,000 emails, $0.90 per 1,000 over
- Billing
- Your Resend account, on your invoice
Provider rates are the providers' own, verified in November 2026 — check their pricing pages for the current numbers, because we do not set them. Two more things worth knowing: receiving is free on Cloudflare Email Routing (unlimited inbound on both Workers plans), and the platform runtime — the worker, the database and the file storage that holds your mail — runs in Flowmails' account, so it does not appear on your Cloudflare bill at all. If you send through Cloudflare, the small sender worker we deploy into your account is billed by Cloudflare for its own invocations.
Storage
Your mail lives in Flowmails. Here is how long we keep it, and how much we keep for you.
Every inbound message, every attachment and every sent copy is stored in Flowmails' own infrastructure — not forwarded to a third-party inbox and forgotten. That is what makes the mailbox, the search and the agent API possible. It also means retention and storage are a plan decision, and the numbers below are the ones we enforce.
Base
$0Mail retention
3 months
Agent event log
30 days
Attachment storage
100 MB
Mail older than the retention window is expired automatically, together with its attachments. The storage allowance is the total size of the attachments we hold for you — not a cap on a single file.
Pro
$9.9 / moMail retention
1 year
Agent event log
90 days
Attachment storage
500 MB
Mail older than the retention window is expired automatically, together with its attachments. The storage allowance is the total size of the attachments we hold for you — not a cap on a single file.
Enterprise
$39.9 / moMail retention
3 years
Agent event log
365 days
Attachment storage
2 GB
Mail older than the retention window is expired automatically, together with its attachments. The storage allowance is the total size of the attachments we hold for you — not a cap on a single file.
FAQ