$forward_method and DNS RR

[Xavier Beaudouin]

Hi :)

I have a couple of mail servers using DNS RR (ipv6).

When forwarding using dns rr with :

$forward_method = 'smtp:rrmail:10025';

I have some issues like this :

451 4.5.0 id=07816-01 - Temporary MTA failure on relaying, From MTA() during fwd-connect (All attempts (1) failed connecting to smtp:rrmail:10025): id=07816-01

Does this means that $forward_method doesn't use DNS to find the way to forward ?

Is there a nice way to make a RR with $forward_method (other than use a proxy / load balancer) ?

Kind regards,
Xavier