Drive-by spam hits wireless LANs

One thing I've noticed that may be an anti-spam measure: STN, the ISP
that servers Marriott hotels (among others) seems to have a
"transparent" proxy intercepting outbound traffic to port 25. Not sure
why they'd do that except to deter check-in spammers. They *don't* do
anything with traffic to port 80, as best I can tell.

    --Steve Bellovin, (me) ("Firewalls" book)