On my new laptop (Acer Aspire) I set up my gmail account without a problem, but T-bird will not set up my business account (on my domain, hosted by midphase/stackmail). I used all the settings from my t-bird account on my old laptop, but nothing I try works. I get a yellow box with the message "Unable to log in at server. Probably wrong configuration, username or password". I also tried lettting Thunderbird find the settings; they didn't work either.

What next?