Tracy works for an insurance company that recently received so much spam that the email server became overwhelmed and shut down. Tracy's supervisor has asked her to make sure this does not happen again.

What is the first thing Tracy should do to prevent this problem from happening again?

D) Email filtering

Explanation:

An email filtering software filters emails and divides them into different categories depending on previously specified criteria. This way a company (or an individual) can organize its email automatically, for example it divides them into work related email, personal email, advertising, etc. Companies can also use this type of programs to filter out spam email.  

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