Two plans. One of them is free.
Free is a real plan, not a trial — no card, no expiry. Pro is $15 a month, and what it buys is room: unlimited credentials, a month of retention, and an inbox your coding agent can read.
Enough to wire a project up and watch its mail arrive.
- 1 SMTP credential
- 25 messages a day
- 7 day retention
- 10 MB per message
- Rendered HTML, plain text and raw
.eml - No agent access over MCP
No card required.
For a team's worth of environments, and for agents.
- Unlimited SMTP credentials
- 5,000 messages a day
- 30 day retention
- 25 MB per message
- Rendered HTML, plain text and raw
.eml - Agent access over MCP, including
wait_for_message
Sign up free, then upgrade from billing. Cancel any time.
What the $15 actually changes.
| Limit | Free | Pro |
|---|---|---|
| Price | $0 | $15 / month |
| SMTP credentials | 1 | Unlimited |
| Messages per day | 25 | 5,000 |
| Retention | 7 days | 30 days |
| Message size | 10 MB | 25 MB |
| Ports 465 and 587, TLS | Yes | Yes |
HTML, text and raw .eml views |
Yes | Yes |
| Agent access over MCP | No | Yes |
The reason most people upgrade.
Pro exposes your inbox as an MCP server, so Claude Code, Cursor and anything else that speaks MCP can trigger a send and then read the message it produced — no polling loop, no human opening a mail client.
It waits
wait_for_message blocks until a matching message is captured, then
returns it.
Read-only
Search, read and wait. An agent cannot delete a message, mint credentials, or send anything at all.
Revocable
Its own API key, separate from your SMTP credentials. Revoke either one without disturbing the other.
Questions about the money.
Is the free plan a trial?
No. It does not expire and it never asks for a card. If 1 credential and 25 messages a day is enough for what you are building, stay on it.
Who charges me?
Paddle is the merchant of record. Paddle sells the subscription, runs the checkout, handles tax and issues the invoice — so any local sales tax or VAT is added at checkout, and we never see or store your card details.
Can I cancel?
Any time, from the billing page. Cancelling stops the renewal rather than cutting you off: Pro stays active until the end of the period you have already paid for, and the account then returns to Free.
What happens to my messages if I downgrade?
The Free limits re-apply, including the 7 day retention window — so messages
older than that stop being available. Extra credentials and agent access stop
working too. Export anything you want to keep as raw .eml before
the period ends.
What happens when I hit the daily limit?
The server refuses the message with a real SMTP reply — 550 5.4.5 Daily
message limit of 25 reached for this account — so your error handling
gets exercised rather than bypassed. Nothing is silently dropped, nothing is
queued, and the counter resets each UTC day.
Do you charge per seat?
No. $15 a month is the account, whatever number of credentials, environments or people are pointed at it.