[exim] Re: MAIL FROM for bounce messages

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Autor: Bill Cole
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A: Ray O'Donnell via Exim-users
Assumpte: [exim] Re: MAIL FROM for bounce messages
On 2024-10-17 at 16:59:54 UTC-0400 (Thu, 17 Oct 2024 20:59:54 +0000)
Ray O'Donnell via Exim-users <ray@???>
is rumored to have said:

> Hi all,
>
> I'm sure a simple question - where do you configure the address used
> in the SMTP "MAIL FROM" command when bounce messages are generated?


You do not.

> In my setup, bounce messages are being rejected because the MAIL FROM
> at SMTP time is empty.


A mail system that rejects "MAIL FROM:<>" is not speaking standard SMTP.

> Its probably obvious, but not to me unfortunately....


The SMTP standard REQUIRES that the MAIL FROM argument be null (<>) on
any messages generated by the mail system itself. This includes bounce
messages. The purpose of this is to make bounce loops impossible.


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Bill Cole
bill@??? or billcole@???
(AKA @grumpybozo@??? and many *@billmail.scconsult.com
addresses)
Not Currently Available For Hire

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