Where is you email hosted? Is the problem just that BT block port 25 for other SMTP, because that can be got round.
I don't quite see the logic of not using the HomeHub from the start. I don't see that it makes any difference to changing the email client setup. But there should be no problem swapping after a few days. Just don't do lots of reconnections in a short period, however you proceed.
Yes, that really is the username to use.
Unless you have something wrong at the moment, and should be getting nearer 8Mbps connection now, ADSL2+ isn't going to give you any more download speed. Just more upload. Note - you didn't mean ADSL 2, you meant ADSL2+ which is not the same thing.
Come the day that BT put you on ADSL2+, which may be Day 1, you will probably find your best option is to force it down to ADSL2, in the interests of both speed and stability.
Have you ever checked your extension wiring or seen what speed you sync at using the test socket, compared to your normal socket?
My broadband basic info/help site - www.robertos.me.uk
| Domains,website and mail hosting - Tsohost
Connection - Plusnet
Extra Fibre (FTTC). Sync ~ 53.7/14.9Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant."
- Jean-Antoine Petit-Senn.
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