Re: Content-type restrictions

[Nick Busigin]

On Wed, 3 Mar 2004, Jan Nieuwenhuizen wrote:

> Yesterday we tried having the mailing list software (Mailman 2.1.2)
> reject mail with application/octet-stream attachments.  The Mailman
> user interface is a bit vague; it turned out that the virus mails
> still get to the mailing lists, with attachments stripped.  This is
> perhaps a worse situation: virus mails are smaller now, but cannot
> easily be detected and filtered anymore.

Smaller is better for those with relatively slow dial-up connections to
the 'net.  When the attachment is stripped, is there a string that could
be injected into the email indicating the attachment removal - which
could be pattern matched by a filter at our end?

> As a more draconian measure we have decided to restrict email to
> simple text/plain (or text/html).  Emails that have mutipart/mixed are
> rejected until further notice.  Sorry for the inconvenience.

The biggest inconvenience with this approach is losing the ability to
include a small PNG file which demonstrates the problem that is being
reported.  Is it possible to filter everything except for PNG files as
attachments? 

                                     Nick

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Nick Busigin                                             address@hidden
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