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K-9 Mail is now Thunderbird
(blog.thunderbird.net)
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Isn't this part of the auto configuration stuff? Basically there's a standard where you can add some DNS records to your domain and/or a standard file on your website so e-mail clients can automatically prepopulate all the email settings so you only need to worry about entering your email and password.
That might be it, Thunderbird works really well with auto configuration of domains that it doesn't know but has DNS entries.