From: Noel Jones (njonesmegan.vbhcs.org)
Date: Wed Jun 01 2005 - 17:15:47 CDT

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At 05:01 PM 6/1/2005, mouss wrote:
>some viruses helo with UPPER.lower (such as MYCOMPUTER.com). you may (at
>your own risk) filter such things with a pcre, something like:
>/^[A-Z]+\.[a-z]+$/ REJECT
>in check_helo_access.
>
>(also, you can restrict the helo to these domains. this is similar to the
>sender restriction above, but using both is tricky. use another
>restriction class if needed).

This isn't useful. Access maps always force the key to lower case.
Matching case is only possible in header/body checks, and then you must use
the /i flag.
I suppose one could carefully construct a header_checks rule to find upper
case HELO names within a Received: header added by the local
machine. Probably more trouble than it's worth.

--
Noel Jones

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