EM-3602
The mail server refused the recipient’s address
Why it happens
Your SMTP server refused to send the message to the recipient’s address: it may be wrong, may not exist, or may not be allowed. The server’s full message is in the technical details.
What to do
Check the contact’s email address and correct it on the contact, then send the reply again.
- HTTP status
- 422
- Retrying does not help