>>>>> On January 16, 2026 Jan Eden via Postfix-users 
>>>>> <[email protected]> wrote:

> If I specify the FQDN with the test message

> echo "Test" | mail -s "Test" [email protected]

> I get the intended result on socialnew, but I fail to understand why social 
> expands
> "root" properly, and socialnew does not.

Is 'mail' the same on both hosts?  On Debian at least, 'mail' can be
provided by both the 'mailutils' and 'bsd-mailx' packages (maybe
others).  These two, at least, behave a bit differently when the
recipient address has no domain.

Greg
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