One of the things I’ve also loved about Exchange is transport rules. If you’re familiar with using rules in Outlook, they function in a similar manner but can be used throughout the organization to enforce account-wide policies.
For example, most organizations like to append a disclaimer to all mail sent from the organization. To add such a rule is really pretty easy. Login to your Office 365 Administration, click Exchange and then go to mail flow|rules.
There’s all kinds of things you can do if you’re creative with it. You can create SPAM filters (Exchange by the way does a pretty awesome job on it’s own of handling SPAM), deny sending attachments to certain distribution lists (like info@) and block mail from specified domains or countries.
Using transport rules is a great skill to have in your toolbox and something you should become familiar with if you have not already had the chance to implement transport rules into your organization’s Exchange strategy.