246
K-9 Mail is now Thunderbird
(blog.thunderbird.net)
All about open source! Feel free to ask questions, and share news, and interesting stuff!
Community icon from opensource.org, but we are not affiliated with them.
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.