691 Password issue and 0x800CC78

1. 691

Access denied because user name and / or password was rejected or Access denied because username and/or password is invalid on the domain

Resolution:

This error can occur if you use a bad username or password; remember in most instances the password is case-sensitive - you will not see the password, so check if Caps Lock is on etc.

2. Protocol: SMTP, Server Response: '550 5.7.1 Access denied', Port: 25, Secure (SSL): No, Server Error: 550, Error Number: 0x800CC78

Remark/Cause:

Possible reason is that user's email client is not running properly/corrupted. Advise user to check on 'My server requires authentication' under the account email configuration and to set the user name and password manually under the settings button which is beside that above mentioned option.