Qmail was running fine today until it came an error:

An unknown error has occurred. Subject 'rqer', Account: '**** ****, Server: '****.*****.***', Protocol: SMTP, Server Response: '451 qq temporary problem (#4.3.0)', Port: 25, Secure(SSL): No, Server Error: 451, Error Number: 0x800CCC6A

any idea?
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Disk full?
# du /var/qmail/queue
check /var/log/maillog or /var/log/messages for other reasons.
jedistarAuthor Commented:
not full
What distro are you running qmail on?

Do you have the packate SUIDPERL installed?

Also if you are running qmail-scanner try stopping it and then restart qmail.  If you are on a Redhat/Fedora solution make sure the server exim is not running.

jedistarAuthor Commented:
My first answer will be, that I hav`nt tried it myself, yet a bit of web search has come up with this:

This message claims that the mail server has a problem with his work. That mean that you should open the log file, and probably learn for yourself what went wrong. The usual stuff is premissions: The qmail user is not allowed writing in the mail folder, qscand has no reading premission on the file, and can`t scan it for viruses, and all that stuff. Just make sure thease are ok.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.