Hi, this is our configuration, we used Sendmail, Qpopper POP3 for clients as Outlook/Thunderbird, Dovecot as IMAP for Rouncube/SquirrelMail. Dovecot is used only for webmails but i want used IMAP for Outlook/Thunderbird but i cant connect to server with Thunderbird to Dovecot-IMAP: Previous administration ist left and i want migrate to IMAP but i want backup in Qpopper when i ruined something My question: It is possible run Qpopper as POP3 and Dovecot IMAP - together ? This is my netstat Code: [root@ntp ****# netstat -l | grep imap tcp 0 0 *:imaps *:* LISTEN tcp 0 0 *:imap *:* LISTEN When i try it from server, Code: telnet localhost 143 , everything is ok. Where can be problem ? Why can t connect with thunderbird/outlook to Dovecot-imap ?