Ockleford Paul (NHS Connecting for Health):
> Ok thanks, I'm not sure I completely understand the syntax of the perl reg ex.
>
> Do you know why even testing the example I was sent through this
> user list it still applies the reg ex to other mime headers? I
> understood that this expression was tested in production by users
> but when I look in my mail log I still see the check being applied
> to other mime headers. Is this something to do with the negative
> matching aspect?
You could burn more taxpayer money wondering why some example did
not work out, or you could use my example that by design does not
match other MIME headers.
Wietse
> Paul
> -----Original Message-----
> From: owner-postfix-us...@postfix.org
> [mailto:owner-postfix-us...@postfix.org] On Behalf Of Wietse Venema
> Sent: 08 June 2010 13:16
> To: Postfix users
> Subject: Re: Setting mime-header checking
>
> Ockleford Paul (NHS Connecting for Health):
> > Hi,
> >
> > Hopefully someone on this list can help me out. I am trying to
> > set up mime-header checking to only allow through emails with a
> > particular file extension, that is I want to block any email
> > without this attachment type or any other attachment type.
>
> First, you need to ensure that the rule is applied only to
> Content-Type/Disposition headers and not to other MIME headers.
>
> Second, negative matching can be tricky. It may be easier to
> eliminate the good cases first, as shown below.
>
> Untested PCRE example:
>
> if /^Content-(Disposition|Type):/
> /name\s*=\s*"?(.*(\.|=2E)(aaa|bbb))(\?=)?"?\s*(;|$)/x DUNNO
> /./ REJECT Attachment name must end in ".aaa" or ".bbb"
> endif
>
> Wietse
>
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