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Re: Forging Return-Path (was: Re: Vintage Charlie....)

2002-05-16 22:37:34
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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