Mutt command not working

[karthickphd]

Hello friend

In my company Fedora 7 server.
In command line mutt command not work.
What may be the problem?
How to clear it?

[coopstah13]

Is the mutt application installed?

[karthickphd]

I alrady installed mutt.
if i type mut then press tab mutt command comes.
if i enter mutt window open and shows mail.
my problem if i use mutt in command line to send file to any email id it does not goes.
when i put mailq -ac command it shows sending mail pending.
the command is
mutt -s "Mutt test" -a /home/friend.txt karthickphd@rediffmail.com < /home/attach.txt

when i see --> mail -ac

[root@vignan ~]# mailq -Ac
/var/spool/clientmqueue (10 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
nAC7ACTi018364 42247 Thu Nov 12 12:40 root
(host map: lookup (rediffmail.com): deferred)
karthickphd@rediffmail.com
nAC7Bd3X018413 42247 Thu Nov 12 12:41 root
(host map: lookup (rediffmail.com): deferred)
karthickphd@rediffmail.com
nAC7RcnA018481 42297 Thu Nov 12 12:57 root
(host map: lookup (rediffmail.com): deferred)
karthickphd@rediffmail.com

How to clear this.

[coopstah13]

possibly the reverse lookup on the machine you are sending the mail from is failing