What kind of "gmail posts" do you get?
On a new account, you'll get some welcome messages, but only the first day.
All my mail goes in my in box, all junk goes into the spam folder where it may stay up to 30 days unless I flush it before that. GMail have an extremely effecient spam filter and never misstaken any legitimate e-mail for spam.
If you want to cancel, you only need to not connect for about 60 days.
Electro, March 2013