I'm not getting any emails for updates in forum posts/topic which I set as watch topic. Another is that my forum subscriptions list is automatically deleted in my account.
For some reasons none of emails sent to your domain (support.xcellence-it.com) could be reached ("message could not be delivered" errors)
I contacted my hosting administrator. According to him, domain is already resolved. and He wants that email header to evaluate error. Can you PM me that email header that you received?