Email limits

Automatic pause

All email goes out through one sending reputation, so an account whose recent live emails bounce or draw spam complaints at a high rate has its live email paused for 24 hours. Today that is more than 5% hard bounces over its last 200 live emails (once it has sent at least 50), or more than 0.1% complaints over its last 1,000, with at least 2 complaints: a single complaint never pauses. While paused, live sends answer 403 SENDING_PAUSED with channel email, scheduled emails wait and go out after the pause, and SMS and test keys are unaffected. We may change these figures to protect deliverability; this page shows the current ones.

The pause fires account.sending_paused with { channel: "email", paused_until, reason, bounce_rate_pct or complaint_rate_pct }, and the account owner is emailed.

Test keys can create 200 emails per account in any 24 hours: one for each email of a single send or an array batch, and one for each recipient of an object batch, scheduled sends included. A request that would go past it is refused whole with 429 TEST_EMAIL_QUOTA_EXCEEDED, before any email is created; the details show the limit and how many were used. Simulated received emails have their own 200 per 24 hours. Live keys have no such quota.