Apparently this problem has been affecting EC2 users for several
months. Some users have also had problems with Spamhaus listings.
Here is a link to one of several related discussion threads on
Amazon's discussion forums:
Apparently some EC2 users have been able to get Amazon to set up
reverse DNS (PTR records) for their IP addresses, which has enabled
some users to get Trend Micro to delist them in MAPS.
This blog posting is an example:
http://www.kinlane.com/?p=1102 and http://www.kinlane.com/?p=1104
Assistant Director, Law Library
University of Mississippi
noe at olemiss dot edu
phone 662-915-6850; fax 662-915-7731