[cobalt-users] Sendmail question

["Brian M. Rahill" <brian@xxxxxxxxxxxxxxxxxxxxxxx>]

Whenever I have a form submitted from my server I get the following message 
in the header:

X-Authentication-Warning: www.myserverdomain.com: nobody set sender to <the 
email address> using -f

This not only looks suspicious to my visitors, but I also just had a bunch 
of things get bounced that were sent to HotMail.  Is it possible HotMail is 
treating this as spam?

Is there a way to get rid of this warning message?

TIA.

Brian