DNS Related Exim problems
When you observe that mails are not working in server for outside domains and if you see the exim logs in server as given below.
2006-06-22 02:33:06 DNS list lookup defer (probably timeout) for 36.168.11.209.bl.spamcop.net: assumed not in list
2006-06-22 02:33:06 DNS list lookup defer (probably timeout) for 112.5.92.213.bl.spamcop.net: assumed not in list
2006-06-22 02:33:06 DNS list lookup defer (probably timeout) for 210.28.225.209.dnsbl.njabl.org: assumed not in list
2006-06-22 02:33:07 DNS list lookup defer (probably timeout) for 242.202.32.83.bl.spamcop.net: assumed not in list
And also as given below.
Could not complete sender verify
By checking using command :-
exim -bt user@outsidedomain.com
DNS host lookup failed.
When you cannot fix it by restarting or reloading the named service.
You can try this Solution:
Just add the IP’s of server’s nameservers to /etc/resolv.conf as shown below but do not remove any previous entries.
nameserver primaryIP
nameserver secondaryIP
Then
pkill named
service named restart
Now check it again.
exim -bt user@outsidedomain.com
It gives the result as below.
router = lookuphost, transport = remote_smtp
host outsidedomain.com [66.67.68.69] MX=0