Email alert is one of the important to know number of Emails in queue, the following script send an email alert more than 100 email in queue,

You may get an error Berkeley DB error, the Berkeley DB is probably corrupt and also get information from the Exim log.

If you unable to send an email from Exim server, you need to check in Exim main error log, it is generated below errors.

Exim is an open source email server, it's a comfortable and running with Unix or Linux Operating system. The Exim security record is much better than Sendmail.

Exim is a message transfer agent (MTA) for hosts that are highly comfortable and running in Unix or Linux Operating system.

You may get an error in exim_mainlog while sending an email as, remote_smtp defer (-53): retry time not reached for any host,

We can manually upgrade the exim mail server latest version using scripts the name of "eximup" this scripts is available with Cpanel.