Tip#7: If you are not receiving surveys...
Make sure check your
blocked address book.
I haven't receive surveys from TestSpin for a while, and finally I emailed them regarding this, and I got a reply the next day. They told me their records indicated that they have been sending me several surveys every week. They want to make sure my ISP is not blocking mass emails. Well, I doubt it's my ISP, so I went in my testspin account and changed the email to one of my gmail account. - there I got surveys invites from TestSpin again, so I am sure it's not my ISP.
Today by chance I checked my blocked address book in my Yahoo email account(the one just for surveys), and there is I found out about the reason.
SurveyAlert@TestSpin is on my blocked address list. I also found out several other survey companies emails on the list, no wonder I haven't heard from them!
So make sure survey site's emails don't go to your bulk folder and not on your blocked address list.