How to Block NDR Spam

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Research shows that up to 90 percent of e-mail received by companies is spam. In the beginning, spam was mainly text-based, but over the past few years, spammers are increasingly using embedded images and attaching common file types, such as mp3s, to gain access to mailboxes. Learn more about the types of spam out there, focusing on NDR, or non-delivery report spam—and how you can block it.

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