UNIX for Dummies Questions & Answers

Hi,
I've looked through the posts here and tried everything and cannot get sendmail to work properly. The server only needs to send and not receive mail. I need it to be routed through an open relay which has ip address of 10.126.35.8.
Here's what I've done so far:
I have amended /etc/mail/sendmail.cf line: DS10.126.35.8

Code:

refresh -s sendmail

Code:

hcaidev [/etc/mail] #echo "test" | sendmail -v john.brickell@hansonplc.com

...and then I get the following error:
john.brickell@hansonplc.com... hansonplc.com: Name server timeout
john.brickell@hansonplc.com... Transient parse error -- message queued for future delivery
john.brickell@hansonplc.com... queued

Please help!!!

Sure looks more like a DNS issue than a sendmail issue.