SMTP
553 Mailbox Name Invalid
The requested action was not taken because the mailbox name is syntactically incorrect. The email address does not conform to the expected format.
이 코드를 보게 되는 경우
When the sender or recipient address contains invalid characters, improper formatting, or violates the server's naming conventions.
해결 방법
Check the email address format — ensure it follows the standard [email protected] pattern with valid characters. Remove any spaces, special characters, or encoding issues from the address.