problem with pop3 connexion

[Pierre-Yves DESLANDES]

Hi I have a big problem, I installed sendmail on a mail server and i wanted to have qmail, so i uninstalled sendmail and install qmail.   I've installed the rpm version of qmail-1.03+patches-7 with the pop3 and smtp modules. 1. when i check my mailbox with pine, it works but i can only read it in read-only mode, why ???   2. when i check too my mailbox from a windows client, i can receive but with imap and in read-only mode too.   3. when i check my mailbox from a windows client, with pop3 protocol, i have an error : can't get lock.   messages from my /var/log/maillog are :   Jan 14 17:22:46 postman pop3d: 947866966.173698 tcpserver: fatal: unable to bind : address already used   Jan 14 17:22:48 postman qmail: 947866968.026429 warning: trouble opening local/5/10562; will try again later     If you could explain me what can be wrong,     Thanks a lot (excuse me for my english),   Pierre-Yves Deslandes