Author: Alan J. Flavell Date: To: Exim users list Subject: Re: [Exim] ACL to ALLOW only mentioned attachments type and block
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On Fri, 26 Mar 2004, Chris Edwards wrote:
> A unix user might be mailing yesterday's results in a file called
> "results.thu" and get blocked. Not really practical here.
According to Internet MIME specifications, the MIME content-type is
authoritative. Filename extensions are insignificant in that context,
by order of the RFCs.
The RFCs don't make any distinction about the OS - they apply to all
email transactions, without distinction. As far as the RFCs are
concerned, the fact that it's a "unix" system is of no particular
concern.
Any software which handles mail attachments according to different
rules is unfit for use in an Internet context. What we're seeing here
is just another symptom of that widespread disease.
