Error when doing email test

[RichieBoy67]

This client has been with me for years and all of sudden email stopped sending. She is using an outlook smpt. Doing the diagnostic got this error..

PHP User Warning: 421 Authorization to the SMTP server failed in ..../includes/class_mail.php on line 715

Is this just an authentication error with their username or password? They are saying they haven't changed it.

Thanks

[snakes1100]

Without looking at the server logs, thats hard to say what the issue is.

It could be as simple as resetting their password.

It could be a connection issue.

[TheLastSuperman]

This client has been with me for years and all of sudden email stopped sending. She is using an outlook smpt. Doing the diagnostic got this error..

PHP User Warning: 421 Authorization to the SMTP server failed in ..../includes/class_mail.php on line 715

Is this just an authentication error with their username or password? They are saying they haven't changed it.

Thanks

Always remember to check your server error_logs, if this is still an issue, you can try the changes mentioned here in post #2:
https://forum.vbulletin.com/forum/vbulletin-4/vbulletin-4-questions-problems-and-troubleshooting/4394260-tls-support