Originally posted by: SystemAdmin

Whenever I try to send a message via sendmail on a server it takes about 1 minute to send also whenever I do a traceroute to the server it doesn´t reach it. I´m 90% sure this is a DNS problem as I don´t have these problems on other AIX servers which have the same sendmail configuration. Does anyone know how I can confirm that this a DNS problem?

If it is a DNS problem I don´t have access to the DNS server so I can´t fix it :o)

Originally posted by: SystemAdmin

Have you also checked the ethernet adapter parameters ? Sometimes the adapter speed is wrong configured, and slows the network traffic.

You can also see the Redbook Troubleshooting in AIX 5L and conducting checks on the network before investigating DNS errors.

Regards.
Silvia.

Originally posted by: SystemAdmin

Ok I tried to do a mail to a user on the system in verbose mode as the network settings seemed fine and I got the following error:

WARNING: local host name (local_host) is not qualified; see cf/README: WHO AM I?

I´m not sure what this means. Can anyone help as I can´t find the cf/README?

Originally posted by: SystemAdmin

Ok I found out what the problem was. The local host name wasn´t defined with the domain name in the /etc/hosts file.

Originally posted by: SystemAdmin

I suppose you have /etc/resolv.conf defined, with
the DNS IP. Also you have /etc/netsvc.conf with the
setting
local=bind,hosts

(first looks for DNS and if not found look in /etc/hosts file).

And your hostname is registered in the DNS, and
the /etc/sendmail.cf have the definition:

DwYourHostName
DmYourDomainName
#Cw localhost $w $?m$w.$m$. YourHostAliases
#Cm $m YourOtherDomainNames
#Cwlocalhost

1. file containing names of hosts for which we receive email

#Fw-o /etc/sendmail.cw

1. my official domain name
2. ... define this only if sendmail cannot automatically determine your domain
3. your domain or you wish to override the default.

Dj$w.$m

The /etc/sendmail.cf explains the definitions you should do.

Regards.
Silvia.