As described I checked my emails from this site and recevied 250 new emails with this info

Hello Puchahawa,

You are receiving this notification because you are watching the topic "[DEV] Board Statistics" at "phpBB.com". This topic has received a reply by nav56 since your last visit. No more notifications will be sent until you visit the topic.

all 250 were sent at 13:37 and 13:38 this afternoon. Not sure if it was a phpbb.com issue or a problem with hotmail maybe?

Attached a copy of the email details for you to check out.