We will suggest using the AntiSpam Blocker so you can control and block these types of emails yourself, that way you won't have to open a ticket for every email you get. Here are the different options for you to manage your own emails.
OUTLOOK
If you are using the Outlook application installed on your computer, you should see some icons like these, this will allow you to block or deny and it will add it to the block list.

OUTLOOK WEB
If you are using the Outlook on the website, you should see a small icon when you select the email, this will give you the same options of adding to spam or denying the email.

CONTROL PANEL
Lastly, your AntiSpam Control panel. Here you can manage any email, you can see all the emails that are going to your inbox, you can deny them, mark them as spam or deliver the email as well. Just visit
https://cp.hornetsecurity.com and login with your Office 365 email and password.
Click on Email Live Tracking, then find the email you want to block and click on the arrow at the end of the list to open the menu.
