i see that nowdays quite often paypal does not sent notification emails for receiving website payments. it is frequently happening to me nowdays. since i have multiple websites and have those emails forward to gmail. Because of this i am not aware of new payments from buyers. how this can be worked out? what do you?
I my case, they aren't mising but yes sometimes been delayed. But its temporary error sometime. May be you would like to contact paypal for the same?