Email was not sent successfully....Response: 535 5.7.3 Authentication unsuccessful.


Description of Error:

When attempting to email out of ESC or send and email page, the following error may be returned:

Email was not sent successfully. The error returned was: Error sending: Request VHJahW51Yxp===

Response: 535 5.7.3 Authentication unsuccessful.

Cause of Error:

An invalid user name or password exists in ESC for the provided SMTP email account.


To correct the problem, log into ESC and go to Company→System Setup→Email. Update the login name and/or password for the Login User to a current correct one.

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