i have the same problem with my emails going to spam - especially with gmail and me.com email addresses. I was told by deanos, that it was because the email address was not the same as the domain name. ie - the email address for sending emailswaslisted as myname@gmail.com and he told me it was going to spam because the domain name is blahblah.com - so the email should be myname@mydomain.com
Unfortunately, after changing this, I still have a problem with emails going to spam folder. But - the end actually is based on how your email provider determines what is and isnt spam, and it does its own thing in that regards.