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DNS Related Exim problems

October 7th, 2009

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

DNS and BIND

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