What wrong ?

[hama]

In /var/log/everything/current:

Feb 16 16:41:19 [postfix/qmgr] 24921C2761: to=<postmaster@_HOSTNAME_.mydomain.net>, relay=none, delay=240077, status=deferred (Name service error for name=_hostname_.mydomain.net type=MX: Host not found, try again)
Feb 16 16:41:19 [postfix/qmgr] 2C92E20B7F: to=<root@_HOSTNAME_.mydomain.net>, relay=none, delay=55001, status=deferred (Name service error for name=_hostname_.mydomain.net type=MX: Host not found, try again)
Feb 16 17:00:02 [postfix/smtp] 9C48121999: to=<postmaster@_HOSTNAME_.mydomain.net>, relay=none, delay=21270, status=deferred (Name service error for name=_hostname_.mydomain.net type=MX: Host not found, try again)
Feb 16 17:00:02 [postfix/smtp] 50B26C68AC: to=<postmaster@_HOSTNAME_.mydomain.net>, relay=none, delay=81560, status=deferred (Name service error for name=_hostname_.mydomain.net type=MX: Host not found, try again)


I can't find where is "_hostname_" in configfile;

# grep -r _hostname_ /etc
and
# grep -r _HOSTNAME_ /etc

but I can't find it.

[UberLord]

have you configured the host names in /etc/postfix/main.cf correctly?

[Janne Pikkarainen]

Today I saw this same message when I emerged mailx. The Gentoo installation in question has some pretty tight compiler settings and I suspect those messed up made my mailx installation. I didn't have time to debug it, but anyway the very same version of mailx installed flawlessly to another computer, which has more normal compiler flags.

So I suspect that due the compiler flags that _HOSTNAME_ thing isn't getting parsed as it usually is.

Edit: Whoops, it was the Postfix queue manager and not mail command which was throwing the error. Maybe the same problem I just described still applies and calming down the compiler flags could make all work?
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[RoeR]

well, i had the same problem but editing the