1. Strong Authentication and Access Controls

• Use strong, unique passwords for every email account. Avoid reuse across sites.
  
• Always enable multi-factor authentication (MFA) (or 2FA). This alone can block many account takeover attacks.
  
• If managing multiple accounts (e.g. work vs personal), use a password manager to generate and store them securely.
  
• Limit administrator privileges and use separate admin accounts for system tasks.
• Disable automatic email forwarding unless explicitly needed.
  

2. Email Protocols and Server Configuration

• If you host your own mail server (or manage one), properly configure:
  • TLS encryption (STARTTLS or SMTPS) for both inbound and outbound traffic
  • SPF (Sender Policy Framework) records to authorize which servers can send mail from your domain
  • DKIM (DomainKeys Identified Mail) so your outgoing messages are signed and verified
  • DMARC (Domain-based Message Authentication, Reporting & Conformance) to instruct receivers how to treat failed SPF/DKIM checks (e.g. reject or quarantine)
  • Regularly monitor DMARC reports to identify abuse.

• Apply rate limiting, greylisting, and anti-spam engines on your mail server to reduce abuse.
• Keep server software and dependent libraries patched continuously.

Thus, how do I secure my mail server? by combining strong encryption, authentication protocols, access controls, spam filtering, and patch management.

3. Use Secure Email Gateways & Email Filtering Security

• Employ a secure email gateway (SEG) that scans inbound and outbound messages for threats (malware, phishing, spam) before they reach you.
  
• The SEG should support sandboxing attachments, URL rewriting, and attachment stripping.
• Use email filtering security tools to block or quarantine suspicious messages (e.g. based on sender reputation, content analysis).
• Continuously review and tune filter rules to minimize false positives and avoid missing threats.
• Be aware: malicious actors sometimes hijack trusted email security services (e.g. link-wrapping features) to bypass filters.
  

4. Encrypt Email Content & Use Secure Email Providers

• For highly sensitive content (passwords, legal documents, personal data), use end-to-end encryptionsuch that only you and the intended recipient (with the key) can read the message. Techniques include PGP/GPG or S/MIME.
• Consider using secure email providers that offer zero-access encryption and built-in privacy. Some of the best secure email providers today are ProtonMail, Tutanota, Mailfence, Hushmail, Posteo, CounterMail, Runbox, etc.

• Among them, ProtonMail is often ranked among the most secure email providers because of its strong encryption and no-access policy.
• When sending a confidential message to someone using a standard email, use encrypted message modes (e.g. password-protected link) so that even non-secure accounts can receive it securely.

5. Client and Device Security

• Use email clients with built-in encryption support or plugin support for PGP / S/MIME.
• Keep your email software, OS, and security tools up to date with patches.
  
• Use endpoint protection (antivirus, antimalware) on every device that accesses email.
• Avoid using public or unsecured Wi-Fi when checking or sending email. If you must, always use a VPN.
• Lock screens and auto-wipe or remote wipe devices where possible (mobile phones, tablets).

6. Behavioral Best Practices

• Never click on suspicious links or attachments without verification. Always hover over links to see actual destination before clicking.
• Verify unusual or urgent requests by a second channel (phone call, in person) even if they appear to be from someone known.
• Be careful when sharing your email address, avoid putting it publicly on forums or websites that attract spammers.
• Use disposable alias addresses or masking where possible (e.g. for web signups).
• Conduct regular phishing awareness training if in an organizational context.
  
• Periodically review your sent items and activity logs to detect unauthorized use.

7. Regular Audits, Monitoring & Recovery Planning

• Periodically audit your email account settings (filters, forwarding rules, authorized apps).
• Monitor your DMARC/SPF/DKIM reports and check for unusual sending sources.
• Enable alerting for suspicious login attempts.
• Maintain backups of important emails (encrypted backups, stored offline) so that even if compromised, you can recover.

If you detect a breach, immediately change passwords, revoke sessions, enforce MFA re-enrollment, and notify affected contacts.