Nullmailer recipient address rejected

[gabrix]

Security Events
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Oct 16 17:02:10 argo nullmailer[29132]: smtp: Failed: 450 <mail.gabrix.ath.cx>: Recipient address rejected: User unknown in local recipient table
Oct 16 17:02:10 argo nullmailer[13133]: Sending failed: Temporary error in sending the message

Did anyone ever seen this error messages?
Than it looks like it starts delivering again!
Oct 16 17:09:11 argo nullmailer[13133]: Delivery complete, 1 message(s) remain.
Oct 16 17:10:11 argo nullmailer[13133]: Delivery complete, 1 message(s) remain.
Oct 16 17:11:11 argo nullmailer[13133]: Delivery complete, 1 message(s) remain.
Oct 16 17:12:11 argo nullmailer[13133]: Delivery complete, 1 message(s) remain
It used to work good and it started all of a sudden i haven't changed nullmailer configuration files,or /etc/aliases ... or any other clue ????
:D Thanks !!!
Debian sarge 3.1 2.6
:eek:

[till]

I guess that the recipient in the first delivery attempt does not exist. have ypu checked your local recipient table?

[gabrix]

how do i do it ?forgive my ignorance!

[falko]

There must be a file/database that contains all recipient addresses. One of them must be missing there.