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Old 30 Jun 2022, 09:47
TheLastSuperman's Avatar
TheLastSuperman TheLastSuperman is offline
Join Date: Sep 2008
Real name: Michael Miller Jr

Originally Posted by RichieBoy67 View Post
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.

Always remember to check your server error_logs, if this is still an issue, you can try the changes mentioned here in post #2:
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