[cobalt-users] Cannot Send emails from Virtual Sites Only from Host - PLEASE HELP

["ambi - amnet" <ambi@xxxxxxxxxxx>]

Email functions perfectly from the host domain in my RAQ3, but not in
virtual sites.

I have DNS properly configured for all virtual sites. Actually I can FTP to
the sites and see the websites in a browser. Also all the virtual sites
receive email perfectly.

The problñem is when I send email from a virtual site, I get this error:

"error : sender domain must resolve"

Also, list in virtual sites do not send emails

My DNS settings for virtual sites are:

A record and reverse for "virtualsite.com"
A record for "www.virtualsite.com"
A record for "mail.virtualsite.com"
MX record using "mail.virtualsite.com" as the high priority mail server

My nameservers are properliy acredited as nameservers with my registrar, and
show correctly in whois lookups.

What can be wrong?

Regards

Johnny