MIME content incorrectly identified as executable

[Nathan Olson]

One of our users sent an HTML email which I believe contained multiple
MIME entities.
These entities were referenced in the email using content-id URLs (RFC 2111).
The content-id URLs ended in '.com', which MailScanner's Filename
Checks identified
as executables, but the content 'pointed' at was actually a gif file.

Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
arrowbullet.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
logos/students_fly_cheaper_sm.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
icons/magnifying_glass.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
navigation/logo.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
bkgrds/cornerTR.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
bkgrds/cornerTL.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
bkgrds/cornerBR.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
bkgrds/cornerBL.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
bkgrds/connectionBg.gif at studentuniverse.com)
Apr 23 13:10:46 vaccine4 MailScanner[25520]: Filename Checks:
Windows/DOS Executable (m3NIAiY7025040 cid:
clear.gif at studentuniverse.com)