Use of Return-Receipt-To and Acknowledge-To headers

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Author: Chris Thompson
Date:  
To: exim-users
Subject: Use of Return-Receipt-To and Acknowledge-To headers
The recent posting by Nigel Armfield to the list had the following headers
in it:

Return-Receipt-To: N.R.Armfield@???
Acknowledge-To: N.R.Armfield@???

A couple of sites (so far) have returned successful delivery reports to
exim-users-request@???, i.e. the return path. This was presumably
provoked by one or both of the above headers.

Whose fault is this? Is there anything we should be doing in the list expansion,
such as stripping such headers, or are these sites in dereliction of de facto
standards by sending the report to the return path rather than the specified
address?

Chris Thompson               Cambridge University Computing Service,
Email: cet1@???    New Museums Site, Cambridge CB2 3QG,
Phone: +44 1223 334715       United Kingdom.