System email address change?

With a recent move to a new data center, the domain for our system emails have changed. We used automated emails with our daily process for informational and report sending.

I edited the /etc/mail/sendmail.cf file where it had an entry pointing to the old mail server so I change this to our new one. This is how it looked:

#DSsmtp:smtprelay.<old>.org
DSsmtp:xxxsmtp@<new>.org

But this didnt solve our problem, when I testing the mail command we are still not getting emails.

Can you guys suggest where else I can look and make changes? Thanks.

Could it be that the new mail relay only accepts e-mail from defined hosts and that your host isn't yet defined?

And did you restart sendmail after you changed the configuration file?

I thought I did, I definitely removed the old domain name but yet in the

/usr/spool/mail log I see the old name there still?

"Your "at" job executed on xxxxx.<old name still>.org on Tue Aug 3 11:48:50 EDT 2010
utbatch.23423.sh"

Why is that?
How do I restart sendmail?

refresh -s sendmail