On 2/4/2013 9:13 PM, Bill Cole wrote: > 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.
Good suggestion, Bill. If mimedefang is intended to only "mangle" messages, a per-user transport into a different postfix instance would work fine. If mimedefang might sometimes reject a message, a transport would not be acceptable as it would cause backscatter by bouncing the message to a possibly forged sender address. -- Noel Jones
