Error 451, Temporary local problem– please try later

EXIM ERROR: Our client could not send email from horde on Linux . The error was :

Horde error 451, response: Temporary local problem – please try later

The mails were not being sent or received to the domain. After some research I found that the error arises due to one of these reasons:

1) The domain is not listed in /etc/localdomains

2) The exim is corrupt or cannot solve functions

Checking For  Host Name In Localdomains

First  I ensured that the host is added in /etc/localdomains. It was added there so i figured out that the problem was somehow associated with exim on our linux server.

Checking EXIM Issue:

After detailed analysis of exim error logs I found the error. The error was found in following directory:

/var/log/exim_rejectlog

It showed some errors with functions in exim. To solve the exim issue, I reinstalled the exim (update) by using following command using ssh

/scripts/eximup --force

The problem was solved and the client was able to receive and send emails. The error temporary local problem was solved by updating exim .