From: Victor Duchovni (Victor.Duchovnimorganstanley.com)
Date: Mon Apr 14 2008 - 17:58:15 CDT

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On Mon, Apr 14, 2008 at 05:42:36PM -0500, /dev/rob0 wrote:

> I was discussing my header check rule today which rejects "mail from
> the past" (obviously invalid Date: header.) It was lame and boring, so
> I was challenged to make a poem of it. Here is the result:
>
> /^Date: .* (19[0-9][0-9]|200[0-7])/ 501 5.5.2

Neither 501, nor 5.5.2 are the correct response codes for header checks.
Use "554 5.7.1" or "554 5.6.0".

    http://tools.ietf.org/html/rfc2821
    http://tools.ietf.org/html/rfc3463

The "554 5.7.1" is more easily written as "REJECT".

--
        Viktor.

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