How do I test how Exim will route a given address?

Question

How do I test how Exim will route a given address?

Answer

This can be done using the "exim -bt" command which can be helpful when troubleshooting email delivery and routing issues. A few examples of this in action can be seen below.

Note: Please replace the email account below with the actual email account you are looking to test the routing for.

# exim -bt email@domain.tld
email@domain.tld
  router = virtual_user, transport = dovecot_virtual_delivery_no_batch

# exim -bt email@domain.tld
email@domain.tld
 router = dkim_lookuphost, transport = dkim_remote_smtp
 host mail.domain.tld [1.2.3.4] MX=5

More information can be found via the man page for the exim command below:

linux.die.net - man exim