Exim progress, still troubled…

Quick problem description: Exim will send mail out, does not seem to receive Quick history: 1) Installed OS X 10.1 Server 2) Installed OS X 10.2 Server (upgrade) 3) Set up multiple IPs with ISP routing multiple domain names to each 4) Set up web and e-mail sharing - works fine 5) Install Exim - no go - libmcrypt problem (as above) 6) Installed OS X 10.2.1 Server 7) libemcrypt problem solved 8) Added multiple domain names to config file, set Apple Mail Server to use Sendmail. 9) IMAP logs in fine, POP checks mail without error, accounts can send mail out w/o problem. What have I forgotten or missed (RTFM) ?