Unfortunately, spam is a fact of life and all spam email should obviously just be deleted. In order to ensure that you do not receive the same email again you can log into the Dcentral control panel and add the sender address to your personal list of spam addresses.
Exchange / 365 mailboxes can add additional licensing in order to mitigate the spam they receive.
If you feel you are receiving way too much spam please log a support request so a member of our team can investigate.