sendmail is not working & on $prompt the cmd sendmail hangs
I am using Red Hat Enterprise Linux ES release 3 (Taroon).
I was using my sendmail command in one of my script and it used to work fine. After few days i have changed my DNS settings and after changing to the new DNS server IPs my sendmail is not working. Even if i give the command on the Linux command promt then it hangs for logtime without any response. My DNS settings are fine as i m able to ping to any websites in the net.
Please let me know how to resolve & debug the issue.
thanks & regards