Emails are not sending; (99) Cannot assign requested address.

Symptoms

The Exim mail queue is building and mail is not leaving the server.

Description 

When checking the Exim Mainlog, Where are the Exim logs? , I see "99 Cannot assign requested address". How can I resolve this?

Workaround

The issue comes from the IP not being bound to the server. Make sure that the IP is listed in /etc/mailips and if it is attached to the server. You can check this through ifconfig and if the IP is not present, you will want to verify the IP address is present in /etc/ips. If it is, you can run /scripts/restartsrv_ipaliases

If your server is NAT, you can run /scripts/build_cpnat and then restart Ipaliases:

/scripts/restartsrv_ipaliases

Finally, start a queue run.

exim -qf &