smtp

[Meghan Madel <meghan server nsnva pvt k12 va us>]

I seemed to have messed something up with my mail 
system when fulling around with another problem.  I am able to send mail
using mine from the server.  However, mac's on our network are not able
to
send mail, only receive it.  The error messages says that the server did
not recognize the recipients.  Any clue where to look?
Thanks,
Meghan