Dnia  4.12.2023 o godz. 14:44:44 lejeczek via Postfix-users pisze:
> 
> I can send email to root@localhost and I thought it was all good but
> today a tool/client wanted to send an email to that address and it
> got:
> ...
> connect from localhost[127.0.0.1]
> NOQUEUE: reject: RCPT from localhost[127.0.0.1]: 504 5.5.2
> <root@localhost>: Recipient address rejected: need fully-qualified
> address; from=<mo...@whale.mine.priv> to=<root@localhost>
[...]
> Say I manually:
> -> $ echo -e "${_when} \n\n${@:2}" | mail -S
> "from=mo...@whale.mine.priv" -s "${_hostUpper}" root@localhos
> ...
> 952E7604CF0D: uid=0 from=<root>
[...]
> 952E7604CF0D: to=<root@localhost>, relay=local, delay=0.04,
> delays=0.02/0.01/0/0.01, dsn=2.0.0, status=sent (forwarded as
> 99753604D3F9)

Do you have "reject_non_fqdn_recipient" anywhere in your
smtpd_*_restrictions in main.cf ?

If you do, that's the restriction that is rejecting your message.

When you send mail locally using the "mail" command, it does not come in via
SMTP, so smtpd_*_restrictions don't apply.
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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