Thanks, the problem was resolved by, reloading the sendmail configuration file sendmail.cf. I had the lines, MAILER(`smtp')dnl MAILER(`procmail')dnl in my sendmail.mc file from which I used the m4 macro to generate the sendmail.cf file, but I guess it didn't take "effect" as procmail was not installed at that stage. After rerunning the m4 macro on sendmail.mc file, everything worked. Thanks a lot everyone. I have tested it on only the private LAN right now with 2 mail accounts and things work fine when the 2 exchange mail with each other using Outlook configured to use the mail server. Reagrds, Tony > > You should be able to configure your sendmail via the sendmail.mc (and > sendmail.cf) file(s). You will want to include the following line in > sendmail.mc: > > mailer(procmail)dns > > Mine comes right after the: > > mailer(smtp)dns > > line. Then all you should have to do is rebuild your sendmail.cf file > (via: make sendmail.cf) and have sendmail reload its configuration > files. (If you're lucky, you won't even have to stop/restart the > already running sendmail daemon....) - : send the line "unsubscribe linux-admin" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html