My mail server is "under attack by spamers" specifically to one email address. I host several domains and postoffices put only one address is getting hammered daily. Appx 50,000 emails a day.
I currently have blacklisted all countries except the US and this is working so the mailbox doesn't get filled. It is one of my clients important emails and would be very difficult to delete it and have the person start over.
Any other suggestions on how to stop the spam??? They are basically the sames messages coming from all over the world.