Qmail log error about 'qmail-smtpd exited by timeout, reset connection'

[Banchak]

Hello All,
As below about qmail error when send from mailer script.

Jul 15 19:11:03 ns1 qmail-queue[26130]: possible qmail-smtpd exited by timeout, reset connection or with "See http://pobox.com/~djb/docs/smtplf.html."
Jul 15 19:11:13 ns1 qmail-queue[26161]: possible qmail-smtpd exited by timeout, reset connection or with "See http://pobox.com/~djb/docs/smtplf.html."
Jul 15 20:21:45 ns1 qmail-queue[29756]: possible qmail-smtpd exited by timeout, reset connection or with "See http://pobox.com/~djb/docs/smtplf.html."


But I'm read in 'http://kb.odin.com/en/810' but i'm checking every code it's not error and i'm test move script to another host (Cpanel,Directadmin) It's work find.

Is it bug ? and Nobody who can fix ?

Thanks
Bancha K.