> > I was thinking of doing this with an after-queue content filter, which > > uses pipe(8) to run a script on each message, and the script itself > > will spawn "postsuper -h <queue_id>" if it decides to put the message > > on hold. > > No this is wrong. Just tag the message, and put appropriate header_checks > in the post-filter Postfix smtpd+cleanup. >
Viktor, thanks for the advice. Would this mean that I need to implement a server with a SMTP interface to act as a proxy? Currently I just have a script that makes a decision, so ideally I'm trying to keep it simple. Also, ideally I would like this to be totally transparent, so adding header tags is undesirable. Sorry for the odd requirement, I'm sure it can be done but I don't quite understand how it all fits together. Thanks.
