Julian Mehnle wrote: > Gordon Messmer wrote: >> Lorenzo Perone wrote: >>> If I understood correctly the rest of this thread, at the moment it is >>> not a good idea to modify the message even once, within a >>> courierfilter. So it wouldn't be possible to save a modified copy, >>> which is desired in my as well as in other setups. >> You can't modify it, but the technique I use in pythonfilter is to >> modify the control files to mark all recipients complete, inject a new, >> modified message into the queue with the same control data, and then >> tell courier to accept the message. courierd will examine the message >> from SMTP and remove it because it's already done, and then deliver the >> modified message that the filter added to the queue. > > Ironically, this, too, defies Courier's attempts at being efficient, at > least for messages that you want to modify. In setups where you modify > practically all messages that you don't reject, it makes Courier's > efficiency attempts pointless.
Not only Courier has to discard the old message, but it has to accept a new one. Perhaps, the "resubmit path" can be optimized slightly? Anyway, it will remain a technique suitable for setups where messages are modified in a few cases only. Filters that always add a header could overwrite a previously inserted header mask. We need a hook to pre-insert masks, then. Filters setting a result that maildrop filters can use, could set a variable in the control file. The latter implies maildrop should be able to retrieve such variables. > My point being, I think Courier should offer a mode where it parses > messages' MIME structure only _after_ having called the courierfilters. As an alternative mode, Courier could rewrite the message before invoking global filters. I.e., invoke global filters just before recipient-specific filters. It may be somewhat inefficient to rewrite a message if a filter is going to discard it. Thus it may still be better for some other filters to be called in one of the currently existing modes. For yet another approach, a filter response could contain some modification commands, e.g. "add this header", "drop that attachment"... ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
