Quick Postfix relay query
i've got a milter (postfix, amavis, spamassassin) up and running between the internet and our exchange server. from the firewall, all port 25 traffic goes through postfix and from there into exchange. it all works fine.
the niggle is, since putting it in i can't use an imap client from home to send mail using my work account. i can read the mail (which i'm presuming is because imap goes straight to exchange) but can't send, so it's obviously some relaying issue i've overlooked.
any ideas on which line of the config file i need to look at?