Re: [FW-1] SMTP resource Action1 tab - replace empty From address

[Crist Clark <[EMAIL PROTECTED]>]

Marius Swart wrote:
>
> FW-1 4.1 - I would like to use the SMTP Resource Action1 tab Rewriting
> Rules (or edit the objects.c file if need be) to replace empty from:<>
> addresses for outbound mail to from:<[EMAIL PROTECTED]>.
>
> Inspecting the objects.c file shows:
> :  (from
> : ()       // Would have liked ("")
> : ()
> )
> which leave the impression that empty from: addresses cannot be rewritten.
>
> The background is that for unknown reasons Exchange Server 5.5 SP4 sends
> all email delivery acknowledgements and read receipts out using an empty
> from, resulting in Mailbox Unavailable reports from SMTP security servers
> at destination sites.

I'm not sure I follow. All MTAs are _required_ to send those messages
with a null return path. In addition, all MTAs must accept messages
with a null sender.

Not using a null sender on error messages can cause error message loops.
This is why use of a null return path is required for these kinds of
messages.
--
Crist J. Clark                               [EMAIL PROTECTED]
Globalstar Communications                                (408) 933-4387

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