Does Thunderbird connect to mail servers with IDN in host names?

I'm looking for a bit of feedback, and maybe some help. I'm not quite 
sure where international support in Thunderbird is at the moment.

For general message composition, reading etc I believe it is reasonable.

Last year I finished the patches that mean that Thunderbird 3 will 
support links with IDNs in emails, so that they can be opened in Firefox 
just by clicking on them.

I'm interested in helping our support for connecting to servers and 
email addressing to move towards better international support. For 
instance, I know we don't support IDN in email addresses at the moment - 
the specifications for that are only just starting to be published in 
draft form.

I am not promising we'll get any more fixes into Thunderbird 3 - we've 
already got a lot of work on. However, if someone does want to work on 
patches and fixing up Thunderbird, I'd be happy to help direct, review etc.

There's a couple of things I'd initially like to know from people who 
have the facilities to test:

1) Does Thunderbird connect to mail servers with IDN in the host names? 
i.e. without using the punycode version.

2) Do servers support non-ascii usernames? If so, does Thunderbird 
support non-ascii usernames as well?

Thanks
Standard8