This argument is covered by draft-moore-auto-email-response-04 which
should be published as an RFC soon. It says:
4. Where to send automatic responses (and where not to send them)
In general, automatic responses SHOULD be sent to the Return-Path field
if generated after delivery. If the response is generated prior to
delivery, the response SHOULD be sent to the reverse-path from the SMTP
MAIL FROM command, or (in a non-SMTP system) to the envelope return
address which serves as the destination for nondelivery reports.
[...]
The Reply-To field SHOULD NOT be used as the destination for automatic
responses from Personal or Group Responders.
Tony.
--
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http://dotat.at/
SHETLAND ISLES: SOUTHWEST 4 OR 5, VEERS WEST OVERNIGHT, THEN NORTH TO
NORTHWEST 3 OR 4, INCREASES 5 IN NORTH LATER. SHOWERS. GOOD. ROUGH, LOCALLY
VERY ROUGH IN NORTHWEST AT FIRST.