The 2026 Small Business Email Security Checklist: 15 Steps to Full Protection

Small businesses are targeted in 43% of all cyberattacks, and email is the primary attack vector. The average cost of a successful email attack on a small business is $108,000 - enough to shut down many companies. But protecting yourself doesn't have to be expensive or complicated.

The 15-Step Checklist

Foundation (Do These First)

1. Scan Your Domain

Before anything else, know where you stand. Use our free email security scanner to get an instant report on your domain's protection level.

2. Set Up SPF

An SPF record tells the world which servers can send email from your domain.

v=spf1 include:_spf.google.com -all

Replace the include with your email provider's SPF. Check our DIY guide for provider-specific instructions.

3. Enable DKIM

DKIM adds a digital signature to every email you send. Enable it in your email provider's admin console:

• Google Workspace: Admin > Apps > Google Workspace > Gmail > Authenticate Email
• Microsoft 365: Microsoft 365 Defender > Email Authentication > DKIM
• Zoho: Admin > Email Authentication > DKIM

4. Implement DMARC

DMARC ties SPF and DKIM together and tells receivers what to do with failures:

v=DMARC1; p=none; rua=mailto:[email protected]

Start with p=none for monitoring, then upgrade to p=reject within 30 days.

5. Verify Everything Worked

Re-scan your domain after making changes. You should see green checkmarks for SPF, DKIM, and DMARC.

Intermediate Steps

6. Upgrade DMARC to Enforcement

After 2-4 weeks of monitoring with p=none:

v=DMARC1; p=reject; rua=mailto:[email protected]; pct=100

7. Enable MFA on All Email Accounts

Multi-factor authentication prevents account takeover, which is the #1 way attackers gain access to legitimate email accounts.

8. Train Your Team

Every employee who uses email needs to know:

• How to spot phishing (even AI-generated phishing)
• Never change payment details based on email alone
• How to report suspicious emails
• That urgency is the #1 manipulation tactic

9. Set Up Email Alerts for Suspicious Activity

Configure your email provider to alert you about:

• Login attempts from new locations
• Email forwarding rule changes
• Password reset attempts
• Bulk email sending

10. Review Third-Party Access

Audit every service that sends email as your domain:

• Marketing platforms (Mailchimp, Constant Contact)
• CRM systems
• Invoicing software
• Customer support tools

Ensure each is included in your SPF record.

Advanced Protection

11. Implement MTA-STS

MTA-STS forces email to be sent over encrypted connections:

_mta-sts.yourdomain.com TXT "v=STSv1; id=20260115"

12. Add TLS-RPT

Get reports on encryption failures:

_smtp._tls.yourdomain.com TXT "v=TLSRPTv1; rua=mailto:[email protected]"

13. Enable DNSSEC

DNSSEC prevents DNS tampering. Enable it through your domain registrar or DNS provider.

14. Set Up Payment Verification Procedures

Create a written policy:

• All wire transfers over $1,000 require phone verification
• Banking detail changes require in-person or video confirmation
• New vendor payments require dual authorization

15. Review Cyber Insurance Coverage

Ensure your policy covers:

• Business email compromise losses
• Social engineering fraud
• Data breach costs
• Business interruption from email outage

Bonus: Technology Assessment

If you're not sure whether your overall technology setup is protecting your business, consider a professional assessment. WiseTechySolutions helps small businesses evaluate their IT infrastructure and identify security gaps beyond just email.

Cost Breakdown

Need Help?

• Free scan: Check your domain now
• DIY guide: Step-by-step instructions
• Professional setup: Our services

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You don't need a big IT budget to have enterprise-grade email security. You just need to follow this checklist.

Print this checklist and track your progress. Your business depends on it.