Issue: I'm trying to configure our mail server to block email from a specific sender reaching a specific recipient. In other words, if one of our employees is getting harassed by a 'stalker', how would one go about blocking, at the MTA (Sendmail) level, a specific sender email address from reaching a particular users inbox? We do not want to capture the email - simply block it before it consumes server resources.
The Sendmail server (MTA) is a front end to our Exchange server so no user accounts exist on the Linux server. We simply use it as a SPAM and Virus scanner then forward clean email to the Exchange server.
Any and all help appreciated
I read the Sendmail, 3rd Edition book and resolved the issue.
Mainly, I had to add
in the /etc/mail/sendmail.mc file
Then I had to create the following entries
in /etc/mail/access file