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Re: Advanced tricks I use to get rid of spam using MX 4xx

To: dl@blackpacket.net, qmail@list.cr.yp.to
Subject: Re: Advanced tricks I use to get rid of spam using MX 4xx
From: Uncle George <netbeans@gatworks.com>
Date: Mon, 27 Nov 2006 16:38:49 -0500
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    To provide reliable mail transmission, the SMTP client MUST be able
    to try (and retry) each of the relevant addresses in this list in
order, until a delivery attempt succeeds.

I think you are missing the *MUST* in the first sentence. There is no try of any other MX if a connection is made, but delivery fails for any reason.

If you look carefully, at the top of the RFC, "SHOULD" is defined:


The SHOULD addresses a configurable limit of MX tries.

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