Q0042
Nigel Metheringham edited this page Nov 29, 2012
·
2 revisions
My ISP's mail server is rejecting bounce messages from Exim, complaining
that they have no sender. The SMTP trace does indeed show that the
sender address is <>. Why is the Sender on the bounce message empty?
Because the RFCs say it must be. Your ISP is at fault. Send them this
extract from RFC 2821 section 6.1 (Reliable Delivery and Replies by
Email): If there is a delivery failure after acceptance of a message,
the receiver-SMTP MUST formulate and mail a notification message. This
notification MUST be sent using a null (<>) reverse path in the
envelope. The recipient of this notification MUST be the address from
the envelope return path (or the Return-Path: header line). However,
if this address is null (<>), the receiver-SMTP MUST NOT send a
notification. The reason that bounce messages have no sender is so that
they themselves cannot provoke further bounces, as this could lead to a
unending exchange of undeliverable messages.
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