On 16 May 2002, John Hardin wrote:
(2) Is it possible to forge a Return-Path: header? Or do the MTAs
override this one?
The Return-Path header is normally the same as the SMTP envelope address,
i.e. the address given to MAIL FROM: in the SMTP conversation. So, yes,
it's possible to set it to just about any syntactically valid address if
one has control over the SMTP conversation.
Cf. sendmail's -f option.
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