James Moe via Postfix-users:
> On 2025-01-22 13:34, Wietse Venema via Postfix-users wrote:
>
> > What was the MAIL FROM address?
> >
> > Command:
> > grep 'qmgr.*6D894104CC9B' /the/maillog/file
> Jan 22 07:25:01 mail-stn14l postfix/qmgr[244191]: 6D894104CC9B: from=<>,
> size=4702, nrcpt=1 (queue active)
>
> Hmm. I am not clear why that is blank.
This is usually an undeliverable mail notification. The null sender
prevents mailer loops when the notification is also undeliverable.
Other (legitimate) appplications may send mail with a null sender
address but they are rare.
There is no canonical_maps or smtp_generic_maps pattern that allows
one to replace the null sender. It can be fixed while receiving
MAIL FROM commands, using smtpd_command_maps but that's a sharp tool.
Wietse
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