On Thu, Feb 11, 2021 at 11:09:06PM -0700, Bob Proulx wrote: > Bryan L. Gay wrote: > > I'm seeing some mailing list messages with to: > > postfix-us...@cloud9.net in the header. I had to update my filters to > > get them sorted into my postfix mailing list folder. > > If one is filtering mail selecting for mail through a mailing list > then one should not use the To: or Cc: for that filtering. The best > and expected header to use is the List-Id: header. That's the > standard mailing list header. See RFC2929. > > RFC 2929 https://tools.ietf.org/html/rfc2919 > > All mail through this mailing list sets this header. > > List-Id: Postfix users <postfix-users@postfix.org> > Yes, that's all very well, but not all mailing lists are so well behaved so a general mailing list filter can't rely on this. One would have to base the filter on a combination of things.
My filter currently relies on a single filtering string so it can't do this but, on thinking about it, it wouldn't be that difficult to come up with a 'double match' approach. However, whether it's worth the effort I'm not sure, it's "good enough" at the moment. -- Chris Green
