Host unknown -Name server- error

[nandak7]

Hi ALL,

I configured a vitrual mail server in sendmail.I get the following error,when I send email to my virtual mail domain from yahoo.
I have entry for MX and A records for my virtual domain in our local dns server.

The original message was received at Fri, 3 Oct 2003 12:19:19 -0500
from web41406.mail.yahoo.com [66.218.93.72]

----- The following addresses had permanent fatal errors -----
<nanda@basinit.com>

----- Transcript of session follows -----
550 5.1.2 <nanda@basinit.com>... Host unknown (Name server: basinit.com: no data known)

Any help is appreciated.
Thanks
Nanda