Anycast provider for SMTP?

Mon Jun 15 17:50:15 UTC 2015

I have a mail system where there are two MX hosts, one in the US and one in
Europe.  Both have a DNS MX record metric of 10 so a bastardized
round-robin takes place.  This does not work so well when one site goes
down.   My solution will be to place a load balancer in a hosting site
(virtual, of course) and have it provide HA.  But what about HA for the
LB?  At first glance anycasting would seem to be a great idea but there is
a problem of broken sessions when routes change.

Have any of you seen something like this work in the wild?

--
Joe Hamelin, W7COM, Tulalip, WA, 360-474-7474