Hello, for smtp, pop3 and imap I am using mail.mydomain.com.au. I have changed the config files: /etc/courier/pop3d.cnf /etc/courier/imapd.cnf I have removed the existing *.pem files an created automatically the *.pem files again. My email client reports domain name mismatch for pop3 and imap. localhost is showing up instead of mail.mydomaun.com.au. SMTP works fine. What is going wrong?