Re: Drive-by spam hits wireless LANs

["Steven M. Bellovin" <smb () research att com>]

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, http://www.research.att.com/~smb (me)
                http://www.wilyhacker.com ("Firewalls" book)