> Are you saying that you simply forward for these 20 mail servers with no clue as to who is a valid user on those servers? > > If that is the case, you may want to implement some way of dumping user names on each target's LDAP systems and creating a virtusertable to validate email addresses. Could be simpler than the problem you describe, plus it would allow you to bounce any email sent to multiple recipients if any single recipient is invalid. > > Another possibility is to implement WebMin on the mail server, and have each domain admin add users to the mail server's virtusertable -- and only accept email for users in virtusertable.
If you can use LDAP, do so. The scripts based on Brian Landers were that I use are at http://www.pccc.com/downloads/ldap/. They create a virtusertable and work quite well. If they are servers that can return an error for an invalid RCPT, I found DFS' recent recommendation to use md_check_against_smtp_server to work perfectly and that is very easily extrapolated for more domains. Basically, configure your MIMEDefang to use filter_recipient (typically a sysconfig change and restart of MD). Then add a function such as: sub filter_recipient { my($recip, $sender, $ip, $host, $first, $helo, $rcpt_mailer, $rcpt_host, $rcpt_addr) = @_; my($answer, $explanation); if ($recip =~ /domain1.com/i) { ($answer, $explanation) = md_check_against_smtp_server($sender, $recip, "helo.mydomain.com", "mailserver.domain1.com"); if ($answer eq 'TEMPFAIL') { $answer = 'CONTINUE'; } return ($answer, $explanation); } return ('CONTINUE', "ok"); } I have the extra TEMPFAIL changed to CONTINUE because I need to queue the mail if I can't get a response. Regards, KAM _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [EMAIL PROTECTED] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
