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MailScanner allows you to block certain kinds of attachments based on their name or the content type.
Two configuration files are responsible for these settings, they are:

/etc/MailScanner/filename.rules.conf
and
/etc/MailScanner/filetype.rules.conf

Below is an example taken from    filename.rules.conf:

# JKF 04/01/2005 More Microsoft security vulnerabilities
deny    \.bmp$      Windows bitmap file security vulnerability                            Possible buffer overflow in Windows
deny    \.ico$        Windows icon file security vulnerability                                 Possible buffer overflow in Windows
deny    \.ani$        Windows animated cursor file security vulnerability             Possible buffer overflow in Windows
deny    \.cur$        Windows cursor file security vulnerability                            Possible buffer overflow in Windows
deny    \.hlp$        Windows help file security vulnerability                                Possible buffer overflow in Windows

You can add,edit or remove lines as you need to. Obviously if you would like to ALLOW a file which is being blocked, you just need to change the " deny " to read " allow ", save the file and restart MailScanner.

Below is an example taken from    filetype.rules.conf:

#deny   MPEG            No MPEG movies          No MPEG movies allowed
#deny   AVI             No AVI movies           No AVI movies allowed
#deny   MNG             No MNG/PNG movies       No MNG movies allowed
#deny   QuickTime       No QuickTime movies     No QuickTime movies allowed
#deny   ASF             No Windows media        No Windows media files allowed

Again, you can add, edit or remove lines as needed. Just remember to restart MailScanner so the changes take effect.