Hi,

We had an upgrade today morning and since then mailx command is not working.
I have been told to change the DNS to use host name as smtp.companyname.com instead of the IP address.
Can someone please help me out to know where can I change this on a Unix Server.

Thanks
Aman

Firstly tell us what kind of UNIX box it is.

Type "uname -a" and post the results.

To me it seems like a communication gap between you and person who told you to use DNS server name insteed of IP Address.

Usually DNS server IP is written in "/etc/resolv.conf"
You can aslo use "/etc/hosts" for local name resolutions

Hi,
if you choose DNS don't forget to change the /etc/nsswitch.conf file!
regards jeorg

I think I should summarise on information required here.

1) Which OS are you using - uname -a
2) Which MTA are you using - i.e. sendmail/postfix
3) What does your nsswitch.conf look like - grep '^hosts' /etc/nsswitch.conf
4) What does your resolv.conf look like - cat /etc/resolv.conf (please obscure the IPs and domain name, etc.)

We cannot assist without accurate and thorough information on what your current setup is.

Cheers,
ZB

Thanks everyone for your help.
The problem is resolved as we went to etc/inet/hosts file and changed the ip address to the new ip address after the upgrade.
This has solved our problem temporarily but I am sure it will pop up again whenever someone changes the ip address of the smtp server.

Thanks
Aman