HELP all my emails out are being marked as (unknown)

HELP all my emails out are being marked as (unknown)

I would like emails out to be marked as donotreply@roaring.biz but for some reason all i get us (unknown) and it usually always gets marked as spam.... is this a php.ini setting? or is there a setting in the mysql database causing this? I need help and fast.. just bought notifications mod and i doubt anyone will get notifications except for their junk mail box... please help if you can. i will be very thankful

Are you using 7.08?

If you are, install the SMTP mod, it handles all that for you.

 I do use that, enabled the SMTP, but I too when receive messages as a member, do not view the sender. It is so funny, on some systems I see the sender (Site Name) and on some computers I do not. For instance I see it on my Blackberry but not on my desktop. It shows blank on the sender.