From: Virus Guy 

I recently tried to send someone @ gmail a rar file as an attachment. 
The file was about 10k.  It's a small (about 50 kb) xml file.  I used 
winrar (offhand not sure what version I've got - there's no intuitive 
way to see the version).  I used the password option and also encrypted 
the file name.

Gmail said this:

============
Your message was rejected by gmail-smtp-in.l.google.com for the 
following reason:

5.7.0 This message was blocked because its content presents a potential
5.7.0 security issue. Please visit
5.7.0  https://support.google.com/mail/?p=BlockedMessage to review our
5.7.0 message content and attachment content guidelines.
=============

So either

(a) gmail doesn't like password-protected rar files, or

(b) gmail does real-time file-cracking and looked inside the archive and 
discovered an xml file and it has a policy of rejecting xml files as 
attachments.

Comments?
--- NewsGate v1.0 gamma 2