5 Jun
2012
5 Jun
'12
2:47 p.m.
On 6/5/12 10:33 AM, "Jeroen Massar" <jeroen@unfix.org> wrote:
Though it can work, it used to be a really bad idea as there where a couple of SMTP systems (Communigate Pro being one of them I recall) which just failed when not seeing an "A" on an MX, this as they did not understand IPv6...
There is bound to be other systems that are broken like that that will not failover to the secondary MX, as such, you might want to add an IPv4 address there too just in case.
Thanks for the advice. You are seeing inbound records in the very first stage. More AAAA RRs are coming. The next 24-48 hours around World IPv6 Launch will be interesting. Jason