I followed the instructions in http://www.howtoforge.com/virtual_users_and_domains_with_postfix_debian_etch. I can send mail from Outlook Express to the mail server but can't retrieve it. Password getting rejected. I get the same error when trying in putty to use user and pass on a telnet. I can't seem to find the answer. Any help would be appreciated.
Any errors in your logs? Please make sure that the Courier configuration looks exactly as in the tutorial. Courier is very finicky about the format.