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Date: Sun, 21 Jan 2007 15:02:08 +0300
From: "Fr. Br. George" <george@altlinux.org>
To: ALT Linux sysadmin discuss <sysadmins@lists.altlinux.org>
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On Wed, Jan 10, 2007 at 01:37:12PM +0400, Sergey wrote:
> On Wednesday 10 January 2007 11:40, Fr. Br. George wrote:
> 
> > > А кто-то ещё, кроме qmail, так делает разьве ?
> 
> > А сколько на свете почтовых серверов?
> 
> Да сколько бы не было. Бакап на то и бакап, чтобы на него шли попытки
> доставки. Если не идут, это исключительно проблема сервера отправителя.
rfc2821:
   When the lookup succeeds, the mapping can result in a list of
   alternative delivery addresses rather than a single address, because
   of multiple MX records, multihoming, or both.  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.  However, there MAY also be a configurable
   limit on the number of alternate addresses that can be tried.  In any
   case, the SMTP client SHOULD try at least two addresses.

Так что вы правы: на первый MX почта не доставлена, и есть второй MX,
отправитель обязан на него полезть. Осталось убедить в этом всяких
умников, начиная с DJ. 

-- 
			George V. Kouryachy (aka Fr. Br. George)
			mailto:george at altlinux_ru