Re: Re: 451 response

От: <CGatePro_at_mx_ru>
Дата: Fri 02 Jul 2004 - 12:51:13 MSD

Hello Vladimir,

Friday, July 2, 2004, 8:52:47 AM, you wrote:

VAB> Что значит "не понимает"? Ему выдали ответ 451, он этот ответ и отработал -
VAB> отложил передачу сообщения, а если у него истекло время висения в очереди -
VAB> то выбросил сообщение с этим кодом ошибки.

Насколько я понимаю, он должен перебрать остальные mx-еры.

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RFC1123
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5.3.4 Reliable Mail Transmission

    To transmit a message, a sender-SMTP determines the IP address     of the target host from the destination address in the     envelope. Specifically, it maps the string to the right of the     "@" sign into an IP address. This mapping or the transfer     itself may fail with a soft error, in which case the senderSMTP      will requeue the outgoing mail for a later retry, as     required in Section 5.3.1.1.

    When it succeeds, the mapping can result in a list of     alternative delivery addresses rather than a single address,     because of (a) multiple MX records, (b) multihoming, or both.     To provide reliable mail transmission, the sender-SMTP MUST be     able to try (and retry) each of the addresses in this list in     order, until a delivery attempt succeeds.

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RFC 2505 Anti-Spam Recommendations February 1999

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1.6. SMTP Return Codes

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   However, 4xx Temporary Errors may have unexpected interaction with    MX-records. If the receiving domain has several MX records and the    lowest preference MX-host refuses to receive mail with a "451"    Response Code, the sending host may choose to - and often will - use    the next host on the MX list. Получено Fri Jul 02 08:51:15 2004