Hi Jenn-- This is a great question! There are two things you can do to adjust the spam filter settings for your account. The first is to adjust the Spam filter to have a stricter Auto-delete threshold score. Our spam filters have a default of 5. You can raise this to a 7 or 8 which can help cut down on spam in general.
The next step is to make sure you’re blacklisting any email coming from all .icu email addresses. In the Spam filters section, there’s an option to add addresses to the blacklist. You’ll want to make sure you’re adding a wildcard blacklist which looks like *@example.icu. With this blacklist, the spam filter will automatically discard all emails and they will not go into your inbox.
If you’ve already set those settings, submit a ticket to us with your domain name and we’ll be happy to take a look!