Florian,

> I was using README.postfix at
> http://www.ijs.si/software/amavisd/README.postfix.html as my basis for
> amavisd-new, which worked fine so far. However, recently I've stumbled
> across an issue in it: When you use sender_canonical_maps with it,
> things don't work as expected, only the Return-Path is modified, but
> not the From header.
>
> After I removed
>   -o local_header_rewrite_clients=
> things seem to work fine, but I'm not sure if it broke something.
> Is this the proposed setting for using sender_canonical_maps, or do
> I mistake something?

The '-o local_header_rewrite_clients=' is intentional, but may not
be necassary. By removing it you allow Postfix to rewrite header
section even after content filtering. This is usually unnecessary
and a waste of time when the rewriting already happened once before
content filtering so there may not be anything there to rewrite again.
At other times this post-filter rewriting is even undesirable, as
it may break a DKIM signature just created by amavisd, e.g. when
a From header field is rewritten by canonical maps or masquerading
after content filtering.

So what you describe would only be infecting mail inserted
into a stream during or after content filtering (e.g. a From
address in notification generated by amavisd would not be
canonicalized). Regular mail which enters Postfix would be
subject to sender_canonical_maps as usual. Are you seing
different behaviour?

  Mark


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