dandnsmith - 1 day ago »
Another possibility for the 'incorrect email address' is that sometimes they run a check (of sorts) for address validity.
I've had my domain addresses fail because of the way this is (sometimes) implemented, so fall back on a gmail address (which, if failing, would raise a great outcry). I've no idea what it is that email address checks can fail on.
Derek
Trevor Wright's suggestion is absolutely correct - or at least it's certainly a reason why the validation fails, there may be others. My normal email address is in the form firstname.surname@domain.com and the website just wouldn't take it, but firstname@domain.com with exactly the same domain was fine. Both addresses are, from an emailing point of view, equally valid.