what is it?

[Andrew Mathews]

"M.W.Chang" wrote:
> 
> logcheck reported this. Is it a mail stucked in the outoging mail queue?
> Any easy way to find that letter?
> 
> Security Violations
> =-=-=-=-=-=-=-=-=-=
> Mar 21 06:06:34 server sendmail[20786]: gethostbyaddr(192.168.0.16)
> failed:
> 1

No, sendmail was simply unable to resolve itself. Is there an entry in
/etc/hosts for the machine name at that ip? Is /etc/nsswitch.conf set to
the order of hosts, dns or vice-versa?