Interesting post from MSExchangeTeam about e-mail spam in Office365.
I wanted to write a series of blog posts talking about email spam in Office 365. While majority of spam mail is blocked by the Office 365 mail security gateways, there are no perfect systems that will block 100% of spam all the time, some can still get through. In case that we do experience spam mail, we can use several tools and configuration options that are available for us in Office 365 to deal with it and improve effectiveness.
In this series, we will quickly review different types of spam mail. Then we will present different tools that we can use for fighting spam mail in an Office 365 environment and try to “match” the “spam tool” for the task based on the type of the spam.
Read more at source: http://blogs.technet.com/b/exchange/archive/2014/07/25/spam-email-and-office-365-environment-overview.aspx