Jose Borges Ferreira:
> Since I have OpenDKIM signing my bounces I believe this was true
> up to some version. Instead it should mention that
> internal_mail_filter_classes should be set to bounce.
Wietse:
> That will break when mail is bounced due to content inspection.
Jose Borges Ferreira:
> Even so, the documentation is misleading. Postfix applies bounces to
> content filter, it may break but applies :p
Postfix does not filter bounces by default, precisely for the reasons
stated in my response above.
> Btw , can you enumerate under which conditions it will break ?
That is the wrong question. The right question when enabling a
feature is **will this feature be safe to use**.
I will give one example of why it is not safe: Postfix accepts mail
into the queue and then bounces it later. When this bounce is blocked
by a filter, it will disappear into a black hole, which violates
the SMTP standard.
That is only one example; that is sufficient to demonstrate that
something is unsafe. Showing that something is safe requires a more
detailed analysis. I have no time for that.
> I've made some mistakes configuring OpenDKIM and couldn't made
> Postfix misbehave.
Not all mistakes result in the loss of mail. I have put a lot of
thought into the Postfix architecture to make it safe to use.
Wietse
