Disable ipv6?

[Jeff <pacavegano%odonian.org@localhost>]

Hello again,

In my previous thread a bug in Rhythmbox was discussed. Following that, 
I thought that I had submitted a bug report. However, in reviewing the 
emails that get sent to root daily, I just noticed this:

(connect to mail.NetBSD.org[2001:470:a085:999::25]:25: No route to host)
                                         gnats-bugs%NetBSD.org@localhost

So I guess that I didn't submit the report, after all.

This network has ipv6 disabled. How can I make NetBSD stop trying to use 
ipv6?

Thanks,
Jeff