Help Email problems

[KMiDigital]

Hi
I am receiving my emails but Google seems to be selective on the ones they send, unless the phone has a spam filter I don't know about? I know the phone has AVG free so could this affect it?
Also I get a alert to say I have a new email and it appears in the top status bar but when I open the email nothing new has arrived?

Other than that I love the phone, I am a convert from Blackberry, so I want to keep it but running my own firm I need to receive my emails when they are sent so any help would be appreciated.

I am running the phones default email as I have my own domain on Google.

Thanks
Keith