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Small business guide

Business Email Security

Quick answer

Business email security combines strong account authentication with domain controls and a practiced process for suspicious messages. The goal is to reduce account takeover and payment fraud.

Who this is for: Any small business that uses email for customer, supplier, or financial communication.

What to do

  1. 01Enable MFA and review forwarding rules on every important mailbox.
  2. 02Inventory legitimate services that send mail for your domain.
  3. 03Configure SPF and DKIM using your provider's current instructions.
  4. 04Start DMARC in monitoring mode and review reports before tightening enforcement.

What this does not cover

Email controls do not determine whether a message is legally required to be retained or whether a suspected fraud event must be reported.

Authoritative source

CISA Phishing Guidance

Last reviewed: September 16, 2026

This page is educational information, not legal advice or a professional security audit. Check the official requirements and get qualified help when your circumstances require it.

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