EM-3603
The mail server does not allow sending from this address
Why it happens
Your SMTP server refused to send the message as this sender address: the account Rabt signs in with may not send from it. The server’s full message is in the technical details.
What to do
Use the credentials of that mailbox itself, or give this account “send as” permission for the address at your email provider, then reconnect.
- HTTP status
- 422
- Retrying does not help