Best Stuff >> Reg a new gmail address & purchase hosting/domain from it.
Set a forwarder for that particular account to your genuine mail address.
Now forwarder means all mail will be forwarded to the new address, but we do not want that

Hence, filter is the option for you.
You can create 20 different filters

create 1 filter and insert the hosting/domain organisation name and site.
Click on Apply
In the end, you'll get the mails from that particular ID to the main ID just for notification procedure.
No need to open inbox of that address each and everytime to check some vital mail arrives or not.
Whenever you need some action for it, then just open the main address inbox and copy the forwarded subject and open that particular mail - Reply.
Done