Re: Possible MX Lookup/Ordering Issue

From: Victor Duchovni (no email)
Date: Thu Nov 01 2007 - 10:36:53 EDT

  • Next message: mouss: "Re: Accept mail for postmaseter, abuse while denying else"

    On Thu, Nov 01, 2007 at 02:24:43PM +0000, wrote:

    > 1) That's not the domain that's having problems.
    > 2) It's MX-es are not running postfix (they are running courier)
    > 3) The MX-es are there for a reason. Google "nolisting".

    Which requires just 3 MX hosts not 66.

    > 4) Lots of MX-es are no excuse whatsoever for not re-trying them in the
    > correct order, whether their IPs get reported back in the additional
    > section or not.

    The additional section is a red herring, please report some evidence.

    How many MX hosts does the domain in question have? How big is the
    DNS response packet?

        20050622

            Cleanup: the DNS lookup code now accommodates name server
            replies longer than 4 kbytes, with a hard upper limit of
            32kbytes. For safety reasons, the number of MX host addresses
            that the SMTP client will try was reduced from unlimited
            to just 5, so that Postfix won't spend forever trying to
            connect to dozens and dozens of bogus MX hosts. Files:
            dns/dns_lookup.c, global/mail_params.h.

    The "5" in question are the best 5 obtained. If the results were
    truncated, and the MX records were shuffled, so that the truncated
    response omits the best MX hosts, don't create jumbo MX RRsets.

    Report "postconf mail_version mail_release_date" output.

    -- 
    	Viktor.
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  • Next message: mouss: "Re: Accept mail for postmaseter, abuse while denying else"





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