Google maps blocked as .ico

[Erik Weber]

I tried to send an (html) email with the following <img> tag:

<img height="185" alt="" 
src="http://mt.google.com/mapdata?cc=no&Point=b&Point.latitude_e6=52536486&Point.longitude_e6=13473255&Point.iconid=15&Point=e&zl=3&w=270&h=185" 
 >

and it gets blocked with the following message:
Feb  4 09:34:10 mr1 MailScanner[10893]: Filename Checks: Windows icon 
file security vulnerability (EC92781E7A.38B97 
mapdata?cc=no&Point=b&Point.latitude_e6=52536486&Point.longitude_e6=13473255&Point.iconid=15&Point=e&zl=3&w=270&h=185)
Feb  4 09:34:10 mr1 MailScanner[10893]: Saved infected 
"mapdata%%3Fcc=no%%26.ico" to 
/var/spool/MailScanner/quarantine/20080204/EC92781E7A.38B97

The only reference to .ico files I have is this in filename.rules.conf:
deny    \.ico$                  Windows icon file security 
vulnerability                                        Possible buffer 
overflow in Windows

Version information:
This is Red Hat Enterprise Linux ES release 4 (Nahant Update 4)
This is Perl version 5.008005 (5.8.5)
2.73    File::Basename
1.35    HTML::Entities
3.54    HTML::Parser
2.37    HTML::TokeParser
1.21    IO
1.10    IO::File
1.71    Mail::Header
3.05    MIME::Base64
5.420   MIME::Decoder
5.420   MIME::Decoder::UU
5.420   MIME::Head
5.420   MIME::Parser
3.03    MIME::QuotedPrint
5.420   MIME::Tools

I've only taken the packages I believe is relevant, if anything is 
missing or unclear please let me know.
Any tips, solutions, advices on how to solve this is highly appreciated.

-- 
Erik Weber