[Mimedefang] Easy way to tell message is sent from local machine?

[Jason Englander]

On Fri, 7 Jun 2002, Nate Carlson wrote:

> Is there an easy way to tell if a message is being sent from the local
> machine out to someone else?

man mimedefang-filter:

       $RelayAddr
              The IP address of the sending relay (as a string consisting
              of four dot-separated decimal numbers.)  One potential  use
              of  $RelayAddr is to limit mailing to certain lists to peo-
              ple within your organization.

So if you "inside" IPs are 192.168.0.*, then you might want to do
something like this:

  if ($RelayAddr =~ /^192\.168\.1\./ || $RelayAddr eq '127.0.0.1') {
    # Take action on mail from the inside
  }

If they all come through a firewall before hitting the mail server, then
any mail from that IP should be from the inside.


Mickey: This question might be a good one for the HOWTO's FAQ

-- 
Jason Englander
jason at englanders.cc