Webmail mail login error : IMAP Error: Login failed for info@suhailah.com from 122.22.122.38.52. AUTHENTICATE PLAIN: Authentication failed. in /usr/local/cpanel/base/3rdparty/roundcube/program/lib/Roundcube/rcube_imap.php on line 184 (GET /cpsess545521111/3rdparty/roundcube/index.php)

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Log to be checked if using roundcube

tail -fn0 /var/cpanel/roundcube/log/errors

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 IMAP Error: Login failed for info@suhailah.com from 122.22.122.38.52. AUTHENTICATE PLAIN: Authentication failed. in /usr/local/cpanel/base/3rdparty/roundcube/program/lib/Roundcube/rcube_imap.php on line 184 (GET /cpsess545521111/3rdparty/roundcube/index.php)

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Please go to WHM > Change Hostname area and change your hostname to server.domain.tld instead of domain.tld. After you've changed the hostname to be a subdomain off the main domain rather than the main domain itself,  After doing that, move these files:

cd /etc

mv userdomains userdomains.bak

mv domainusers domainusers.bak

mv trueuserdomains trueuserdomains.bak

After moving those files, then run this command:

/scripts/updateuserdomains

You will get messages about the files you’ve moved no longer existing. Those files will be recreated by the command.