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Email security: protecting your domains and your messages

For a business, email is both a work tool and a way in. A third party can send messages using your domain, an account can be compromised, and an unpatched webmail can expose a whole mail system. These risks are not only technical: they directly affect your payments, your customers and the credibility of your name.

This section brings together our articles on protecting domains and messages. You will find the role of DMARC for small and mid-sized companies, SPF syntax and its ten-lookup limit, how SRS works when mail is forwarded, and transport security with MTA-STS and TLS-RPT.

Other articles cover cases that authentication alone does not solve: fraud run from a genuine compromised mailbox, forgotten parked domains, applications still connected through SMTP AUTH Basic, or vulnerable mail servers. The goal stays the same: knowing what your settings really cover, what they do not, and where to start.