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[cconn]

I am using Thunderbird to access IMAP on a dual-stacked host, and for some reason it seems to always choose IPv4 over IPv6.  From the commandline I always seem to resolve a IPv6 address for ping/tracert, yet Thunderbird never bothers to try it.  I ended up making a v6-only hostname for the IMAP server in order to test.

Is there a hidden option somewhere to set preference of v6 over v4 in Thunderbird?

[cholzhauer]

Ive never seen one, but again I guess I haven't looked either.  I assume you're using the latest version?

[cconn]

using Thunderbird 8.0 actually, just upgraded to 9.0.1.  It auto-updates now and then, strange that I would be what appears to be quite a bit behind, I didn't bother to check.

Going to switch back to the dual-stack hostname and see what it chooses.

[broquea]

I checked on my win7 and linux machines, and they are all preferring ipv6 talking to a dual-stack server. Don't really see an option to prefer one over another.

[adiblol]

See /etc/gai.conf

[cconn]

must have been due to the fact I was running 8.0 since it seems to reliably connect on the v6 address now.  Sorry for the noise