Tariq Ismail Dalvi wrote:

Hello everyone

I am using CentOS 5.2 and facing a browsing problem I had complete system update of 71 applications recently and after the update completed my system can receive emails but cannot send and cannot browse get error domain not found, besides ftping is working fine web servers are working fine how can i fix this or roll back to my previous configuration of system.

You should examine the log files in /var/log/maillog, isolate the exact error message, and then post it.

Assuming you're using sendmail, I would check the file

/etc/mail/sendmail.cf

for the value of the relay

# "Smart" relay host (may be null) DS

and see if it's set a value which makes sense for your situation.