On 4 Feb 2013, at 15:26, Mark Alan wrote:
The problem is how to do it in order to to process a SINGLE target email address (the address of a given mailing list), without consuming unnecessary machine resources, i.e., without "miltering" all the email that arrives at the postfix server.
As Noel said, Postfix offers no way to do that. You could do it inside MD, but it won't be very resource-sparing to do so because MD will build its per-message working directory for you before your filter can tell it to pass the message along unmolested. An alternative to hooking the MD milter into your main smtpd would be to define a transport in master.cf running smtpd with MD as a milter, and use postfix's transport map to route just the one address there. This would also allow you to avoid the ugly problem of envelope recipient splitting inside MD. You can probably get a more complete answer on the MD mailing list. Also note that configuring MD means writing a collection of Perl functions with predefined interfaces to implement the message filtering. If you are not comfortable writing Perl, MD may not be the right tool for you.
