MyDoom question

[Billy A. Pumphrey]

So far our MailScanner has caught these virues from entering.  I got a
phone call saying that they got a email from us user at woodmaclaw.com with
the virus.  Also the user that it was sent from doesn't exist within the
company. Does that mean that someone is using my server as a relay?

Virus Count 
W32/MyDoom-A 167 
W32/Klez-H 8 
W32/Gibe-F 6 
W32/Mimail-A 2 
Troj/Sefex-A 2 
W32/Bagle-A 2 
W32/Mimail-I 1 
W32/Bugbear-B 1