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Re: Strange determination of an error address in Zmailer 2.1.2
Matti Aarnio <firstname.lastname@example.org> writes:
> The Algorithm within router is such that when it needs to
> look up for an error return address, it picks them in order:
> Sender: ...
> Errors-To: ...
> MAIL FROM:<...>
> ( router/rfc822.c:erraddress() )
> This, like Tom Samplonius noted, is according to RFC-822...
> (Well, "Errors-To:" I could not find..)
Absolutely incorrect. From RFC 1123, section 5.3.3:
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; see Section 3.6 of RFC-821. The
recipient of this notification SHOULD be the address from the
envelope return path (or the Return-Path: line). However, if
this address is null ("<>"), the receiver-SMTP MUST NOT send a
notification. If the address is an explicit source route, it
SHOULD be stripped down to its final hop.
Transport agents should always user the envelope return path given
in the MAIL FROM: command for notification messages.
A subtlety is that when the envelope return path is null ("<>"), the
notification should be sent to the local postmaster. Otherwise, when
mail arrives with invalid addresses in both the forward and reverse
paths, it will be silently discarded.
_.John G. Myers Internet: jgm+@CMU.EDU