The following is an answer from GN to my question about not receiving e-mails anymore. I have added No reply GN to my address book. I have since then received a couple of notifications of PM's. Not sure if it was that or something else that did the trick!
"Thanks for getting in touch.
We've had one user who's had the same issue - so tech are looking into it.
Can you just check your PM settings (http://www.gransnet.com/pm?call=Settings&from=/pm%3Fcall=Inbox&fromtitle=Inbox) just in case? The top box should be ticked.
Also, have you checked your junk mail? Sometimes they accidentally get sent to the wrong place. It might help to add '[email protected]' to your address book - to make sure all mails go into your inbox."