Although yahoo.com has 4 mx records and each mx record
has 4 A records:

   yahoo.com.   ... MX   1 mx1.mail.yahoo.com.
   yahoo.com.   ... MX   5 mx4.mail.yahoo.com.
   ...
   mx1.mail.yahoo.com.   ... A   67.28.113.10
   mx1.mail.yahoo.com.   ... A   67.28.113.11
   ...
   mx4.mail.yahoo.com.   ... A   66.218.86.156

xmail tries only one A record for each mx record, in
case of successive failures. This is by design.

Please, is it an RFC recommendation? I understand the
multiple A records are intended to provide load
balance, but what is an mta supposed to do in case of
failure? Shouldn't it try all A records till success?

Many thanks.

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