I am currently experiencing problems with incoming SMTP mail. (Outgoing SMTP mail is fine).
I have an SMTP gateway running Mailsweeper in the DMZ which squirts incoming SMTP mail onto an Exchange 2000 box. No external emails are getting in. External senders of mail receive NDR's of 5.7.1 (Permanent Failure - security: delivery not authorised, message refused). Unable to relay.
I have activated logging on the connector and noticed that SMTP sessions are initiated by the sender with the local Exchange box but local delivery is refused.
Anyone any ideas?