Preventing Relays with Sendmail
Posted on 1998-12-10
I have a small LAN, where the computers on the inside use the firewall to send messages. While this works exactly as configured, I wish to minimizer my chances of someone discovering that the port is opened and using the server to SPAM others.
Anyone can offer insite on the .M4 entries to place in the sendmail.m4 file? I have been given direct modifications to do with sendmail.cf, but I would much rather have the appropriate M4 entries.
I would of posted my M4 file. But since it contains information on the mail server location and addess I decided that it might be a security risk. It can be given at a later time if the need for it becomes evident.