135 lines
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135 lines
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From spamassassin-talk-admin@lists.sourceforge.net Fri Sep 13 20:45:28 2002
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(8.12.6/8.12.6/Submit) id g8DJ1I96022970; Fri, 13 Sep 2002 15:01:18 -0400
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From: Theo Van Dinter <felicity@kluge.net>
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To: vernon@comp-wiz.com
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Cc: spamassassin-talk <spamassassin-talk@example.sourceforge.net>
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Subject: Re: [SAtalk] OT: DNS MX Record Clarification Please
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Message-Id: <20020913190117.GG5897@kluge.net>
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References: <20020913151635.M21128@b2unow.com>
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<20020913183343.M49078@b2unow.com>
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X-Original-Date: Fri, 13 Sep 2002 15:01:18 -0400
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Date: Fri, 13 Sep 2002 15:01:18 -0400
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--Fnm8lRGFTVS/3GuM
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On Fri, Sep 13, 2002 at 01:33:43PM -0500, vernon wrote:
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> As I understand it, DNS A records are used in a rotating fashion for load
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> balancing, but DNS MX records are used in order or prority, meaning the 10
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> before the 20 and only 20 if the 10 isn't available.
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That's the theory, yes.
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> But only some of the mail is actually being scanned which leads me to
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> believe that not all of the mail is actually hitting that box and the 10
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> never goes down. Why? Have I got something confused here?
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No, but either due to some technical glitch, or downright just wanting
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to do so, people send to the secondary. It's a semi-usual spammer trick
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actually to bypass the main server and send directly to a secondary
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since it will either have less filtering, or be "trusted", or ...
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MX records in the mail world are all explained in RFC 2821, section 5:
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[...]
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Multiple MX records contain a preference indication that MUST be used
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in sorting (see below). Lower numbers are more preferred than higher
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ones. If there are multiple destinations with the same preference
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and there is no clear reason to favor one (e.g., by recognition of an
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easily-reached address), then the sender-SMTP MUST randomize them to
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spread the load across multiple mail exchangers for a specific
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organization.
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[...]
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If it determines that it should relay the message without rewriting
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the address, it MUST sort the MX records to determine candidates for
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delivery. The records are first ordered by preference, with the
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lowest-numbered records being most preferred. The relay host MUST
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then inspect the list for any of the names or addresses by which it
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might be known in mail transactions. If a matching record is found,
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all records at that preference level and higher-numbered ones MUST be
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discarded from consideration. If there are no records left at that
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point, it is an error condition, and the message MUST be returned as
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undeliverable. If records do remain, they SHOULD be tried, best
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preference first, as described above.
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--=20
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Randomly Generated Tagline:
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"Now let's say I like sheep... And now let's say I take the sheep to a=20
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Christmas party..." - Bob Golub
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--Fnm8lRGFTVS/3GuM
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--Fnm8lRGFTVS/3GuM--
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-------------------------------------------------------
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This sf.net email is sponsored by:ThinkGeek
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Welcome to geek heaven.
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