On 11/22/2016 3:06 PM, MRob wrote:
> I'd like to understand the differences in the envelope fields at
> points where external filtering can happen:

please see:
http://www.postfix.org/ADDRESS_REWRITING_README.html
http://www.postfix.org/OVERVIEW.html


> Off-topic part is whether anyone knows the effects any such changes
> would have on spam filtering?

Minimal to none, unless you're trying to apply different filter
rules depending on the recipient.  In that case, the details are
documented;
http://www.postfix.org/documentation.html



  -- Noel Jones

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