I am having difficulty with some email addresses. Most just go through, but if they don't I get :Unable to connect to mail server "<<email address>>".
When I open email settings and click the second box; "Use SMTP..." I get an error box : "Mail host server error (MAIL FROM not accepted). Please check you email settings (550)." My mail host is correct, though.
I am confused because I can send this address an email directly from my mail program (Windows Live Mail), just not through Express Invoice, which I love, btw.