I just installed the other day, and also tested with eicar. It caught eicar as well as a friendly sample of sircam32 which simeone was nice enough to send me...
Check that your domain listing is for both:
yourdomain.xxx
e-smith.yourdomain.xxx
It seems to be a peculiarity of the internal routing, and it doesn't treat the re-routed email the same as external mail.
If all else fails, post a portion of /var/log/maillog that has been stripped of sensitive info..