Berkeley CSUA MOTD:Entry 21940
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2025/05/27 [General] UID:1000 Activity:popular
5/27    

2001/7/25 [Computer/SW/Mail] UID:21940 Activity:nil 71%like:22153
7/24    Sendmail/DNS question: If A has a MX 0 to B and B is MX 0 to itself
        and MX 10 to C, does A need an MX 10 to C or will mail to foo@A
        automagically go to C if B is down?
        \_ MXes don't chain; the target of an MX is a hostname, not another
           target for an MX lookup:
           ; domain file for http://bar.com
           mail IN MX 10 http://mail.foo.com.
           ; SMTP requires doing an MX lookup for http://bar.com, which will give it
           ; back http://mail.foo.com.  it will _not_ do an MX lookup on http://mail.foo.com,
           ; merely an A record lookup (ordinary "name lookup")
           \- if there is not second MX for A -> C, then the mail will wait
           for B to come back. If there is a secondary MX for A -> C and
           B is down, I *believe* the answer is "it depends" ... you arent
           obligated to try another MX I think. Dont quote me on this.
           Recent sendmail should make one pass through them until one
           works or all of them are down, unless you get some exotic SMTP
           code which halts the whole process. If you are 100% sendmail see
           BAT II. If you have mixed agents, good luck reading the RFCs and
           sorting out the "musts" and "shoulds". This is subject to your
           not doing any of the weird things that turn off MX lookups. --psb
2025/05/27 [General] UID:1000 Activity:popular
5/27    

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2007/1/30 [Computer/SW/Mail] UID:45619 Activity:nil 76%like:45624
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Cache (72 bytes)
bar.com -> www.bar.com/
Wine rack is hand made due to demand may take 4 to 6 weeks for delivery.
Cache (771 bytes)
mail.foo.com
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