I ran across exactly the same issue mentioned in http://twister.fastxs.net/pipermail/dbmail-dev/2004-May/003852.html recently, while setting up an openwebmail installation, so I did a bit of looking into it.
>From rfc 1734: If the requested authentication mechanism is not supported, the server should reject the AUTH command by sending a negative response. dbmail-pop3d doesn't support any AUTH mechanisms, so any requested should return some -ERR (which 2.0.x and 2.1.x do, but not 1.2.x). Nowhere does it allow an "AUTH" command without naming a mechanism, so doing so should also return an -ERR. So in pop3.c, this section: case POP3_AUTH: { if (session->state != POP3_AUTHORIZATION_STATE) return pop3_error(session, stream, "-ERR wrong command mode, sir\r\n"); /* if we get anything but the naked "auth" command, * we return an error */ if (value != NULL) return pop3_error(session, stream, "-ERR unknown authorization mechanism\r\n"); fprintf((FILE *) stream, "+OK List of supported mechanisms\r\n" "X-NONE-SO-USE-APOP\r\n.\r\n"); return 1; } should change to something more like: case POP3_AUTH: { if (session->state != POP3_AUTHORIZATION_STATE) return pop3_error(session, stream, "-ERR wrong command mode, sir\r\n"); fprintf((FILE *) stream, "-ERR AUTH command not supported.\r\n"); return 1; } 1.2.x source is almost that already, just need to change the +OK message to the above -ERR message. That should fix openwebmail and probably some others. -- Jesse Norell - [EMAIL PROTECTED] Kentec Communications, Inc.