one MX record points to many A records

[news.plus.net]

But these people have MORE than one MX.

Example given has a single MX. Will each address given for the single MX 
be tried until one works?

Len Conrad wrote:
> 
>>Do you think this might cause anybody any problems - rather than have
>>many MX records with one A record for each?
> 
> 
> seems to work for these people:
> 
> # dig aol.com mx
> 
> ; <<>> DiG 8.3 <<>> aol.com mx
> ;; res options: init recurs defnam dnsrch
> ;; got answer:
> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
> ;; flags: qr aa rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 4, ADDITIONAL: 18
> ;; QUERY SECTION:
> ;;      aol.com, type = MX, class = IN
> 
> ;; ANSWER SECTION:
> aol.com.                1H IN MX        15 mailin-03.mx.aol.com.
> aol.com.                1H IN MX        15 mailin-04.mx.aol.com.
> aol.com.                1H IN MX        15 mailin-01.mx.aol.com.
> aol.com.                1H IN MX        15 mailin-02.mx.aol.com.
> 
> ;; AUTHORITY SECTION:
> aol.com.                1H IN NS        dns-01.ns.aol.com.
> aol.com.                1H IN NS        dns-02.ns.aol.com.
> aol.com.                1H IN NS        dns-06.ns.aol.com.
> aol.com.                1H IN NS        dns-07.ns.aol.com.
> 
> ;; ADDITIONAL SECTION:
> mailin-03.mx.aol.com.   5M IN A         64.12.136.217
> mailin-03.mx.aol.com.   5M IN A         64.12.136.249
> mailin-03.mx.aol.com.   5M IN A         64.12.137.121
> mailin-03.mx.aol.com.   5M IN A         64.12.137.152
> mailin-03.mx.aol.com.   5M IN A         205.188.158.25
> mailin-04.mx.aol.com.   5M IN A         152.163.224.122
> mailin-04.mx.aol.com.   5M IN A         64.12.136.153
> mailin-04.mx.aol.com.   5M IN A         64.12.137.121
> mailin-04.mx.aol.com.   5M IN A         64.12.137.152
> mailin-01.mx.aol.com.   5M IN A         152.163.224.26
> mailin-01.mx.aol.com.   5M IN A         64.12.136.57
> mailin-01.mx.aol.com.   5M IN A         205.188.156.122
> mailin-01.mx.aol.com.   5M IN A         64.12.137.89
> mailin-01.mx.aol.com.   5M IN A         64.12.137.184
> dns-01.ns.aol.com.      1H IN A         152.163.159.232
> dns-02.ns.aol.com.      1H IN A         205.188.157.232
> dns-06.ns.aol.com.      1H IN A         149.174.211.8
> dns-07.ns.aol.com.      1H IN A         64.12.51.132
> 
> :)
> 
> Len
> 
> 
> 
> 
> ____________________________________________________________________
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