I just want to get this straight. Please, someone clarify his to me. Consider Cyrus and Postifx runing on different servers and having to communicate with each other through lmtp. 1) Here´s the line we all know from cyrus.conf that is gonna bring lmtp listening on tcp: lmtp cmd="/usr/local/cyrus/bin/lmtpd" listen="lmtp" prefork=1 maxchild=100 Is that enough on the cyrus side ? 2) posfix's main.cf : mailbox_transport = inet:[1.2.3.4]:24 3) On some previous reply someone wrote about adding the following to relay_domains : example.com lmtp:unix:public/lmtp # for a local LMTP socket example.com inet:[1.2.3.4]:24 # for a remote LMTP socket and then to extend transport_maps: transport_maps=hash:/etc/postfix/transports,hash:/etc/postfix/relay_domains. Cant figure out why this is necesary. 4) And last but not least. How postfix authenticates in anyway so Cyrus ???? Thanks for all who answered and for the patience Diego ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html