Exim mail bounce back - retry time not reached for any host after a long failure period

 I've recently came across the following exim error when sending emails to specific domains:

T=remote_smtp: retry time not reached for any host after a long failure period

The first thing I did was to check that there was nothing wrong with the resolver on my server and ran a few DNS lookups from my server to the recipient's domain.

Once I was sure that both the resolver and the recipient's DNS were all correct, I had to do the following:

1.) Go to: /var/spool/exim/db

cd /var/spool/exim/db

2.) Delete these files:

rm retry retry.lockfile wait-remote_smtp wait-remote_smtp.lockfile

3.) Then restart your exim service:

service exim restart

After that you should be able to send emails to the domain in question as normal.

If you want to learn more about Linux in general I strongly recommend the following book:

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