Sendmail (host map: lookup (domain.com): deferred

If you get this error... on sendmail.

[root@Test_Srv ~]# mailq
/var/spool/mqueue (9 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
o1RKaZr6018628 10 Wed Feb 10 21:37 abc@abc.com
(host map: lookup (abc.com): deferred)




Solution:-

Check your DNS resoulation.

Try to nslookup on domain or dig.

[root@inf1sysadm1 ~]# dig abc.com

; <<>> DiG 9.6.1-P2-RedHat-9.6.1-7.P2.fc11 <<>> abc.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7633
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3


Domain name must be resolve.