SMTP Secure (SMTPS): 587

Security Weaknesses:

• Misconfigured or weak SSL/TLS versions expose communication to interception.

• Susceptible to email spoofing and phishing attacks.

• Lack of SPF, DKIM, and DMARC configurations increases spoofing risks.

Security Defense and Mitigation Measures:

• Require TLS 1.2 or higher for secure email transmission.

• Configure SPF, DKIM, and DMARC records to validate email authenticity.

• Implement email filtering solutions to detect phishing attempts.

• Regularly update and patch SMTPS servers.

Indicators of Compromise or Attack:

• Increased delivery failures due to spoofed emails.

• Unusual outbound email traffic patterns.

• Repeated login attempts from unknown IPs.