Explicit priority MX with only AAAA record
steve at ibctech.ca
Wed Jun 25 15:59:59 CEST 2008
Marcus Stoegbauer wrote:
>> I've been considering breaking that, and having separate explicit MX
>> records for each an A and an AAAA record, and setting the IPv6 MX as
>> priority, the v4 as next priority.
> We had this setup for about 1.5 years for our (really small) company
> domain and I didn't receive any complaints during this time that mails
> couldn't be delivered or got lost.
> However there are said to be mail daemons which don't behave well when
> the first MX can't be resolved to an A record and stop delivering the
> mail altogether.
Thats exactly what I am afraid of happening.
> I don't see the upside on changing from "AAAA/A" to "first AAAA, then
> A". In my eyes your current setup is the best and easiest solution
> because it should give you exactly the same behaviour, no matter which
> IP protocol you're using.
I had been thinking that. Any implementation I've run into so far will
always prefer IPv6 if it is enabled, so I'll take your advice and leave
More information about the ipv6-ops