EM-3708
The mailbox reached Gmail’s daily sending limit
Why it happens
Google allows about 2,000 messages a day per Workspace user, shared by all its aliases. This mailbox reached it, so Gmail refused to send. Sending comes back on its own within 24 hours.
What to do
Send the reply again once that time has passed, or from another email channel. To avoid it, spread sending over more than one mailbox.
- HTTP status
- 429
- Retrying does not help