Bug in qmail (brobably IPv6)!

[Jacek Konieczny]

On a host without IPv6 I am getting following error when trying to deliver
 a message to domain "bnet.pl". It seems it is because the domain has 
as its primary MX both IPv4 and IPv6 addresses.

delivery 1: deferral: System_resources_temporarily_unavailable._(#4.3.0)/

Because of that I (and other users of such domain) probably didn't receive
a lot of important messages from our qmail's users.

Could someone who has prepared the patch check it?

Greets,
        Jacek