Authentication Failed - Email password is not working in desktop application

I tried accessing the email account from one of the email client on my desktop. It was generating the error as “Authentication Failed”. When I tried login using webmail client then it was working fine.

Solution -

1. Make sure the password which you've typed in the email client is correct. There might be small typo.
2. If the password is correct then telnet to the server for further verification -

telnet domain_name 110Trying 1.2.3.4...
Connected to domain_name
Escape character is '^]'.
+OK Dovecot ready.
user email_address
+OK
pass Enter the Password of associated email address
-ERR [AUTH] Authentication failed.

Note -
1. Replace the domain_name with your domain name.
2. Replace the email_address with your email address and password with correct password.

From provided output, the password was working for the web interface but server was giving the error message as 'Authentication Failed'.

So you will need to change the password of email account for which you are facing the issue. Now again give a try and telnet to server as below and now it is working-

telnet domain_name 110Trying 1.2.3.4...
Connected to domain_name
Escape character is '^]'.
+OK Dovecot ready.
user email_address
+OK
[b]pass Enter the Password of associated email address[/b]
+OK Logged in.
list
+OK 12 messages:

I used the new password and tried login, it's started workingIt is because the password format is not supported by the email client.
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