Exim, can send mail but not receive

[Gordon Chapman]

Just installed Exim 3.35, I can send mail from the server and from a machine on the LAN. The machine has the domain MX record pointing to it. The /var/mail/$user user files receive the mail but clients seem incapable of collecting this mail. Using outlook express, get the following Your server has unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity. Account: 'LANMAIL', Server: 'mailserver_name', Protocol: POP3, Port: 110, Secure(SSL): No, Error Number: 0x800CCC0F What do I need to do to allow mail to be collected Many Thanks Gordon Chapman