---- dovecot and cyrus-imapd are 2 imap/pop3 servers included in CentOS 4 distribution. Qpopper is neither distributed, maintained or updated as part of CentOS. I would heavily recommend that you use dovecot or cyrus- imapd (my preference is for cyrus-imapd but many believe dovecot is easier). You can have TLS/MTA and normal MTA on the same system, they must both be specifically enabled as Alexander has suggested. Craig