Email Messaging Protocols and Port Exposure | UpGuard

This article explains email messaging protocols (SMTP, IMAP, POP), outlines security risks from unencrypted or misconfigured email ports and spoofing, and recommends mitigations — including SPF/DKIM/DMARC, encrypted protocols (IMAPS/POP3S/SMTPS), attachment restrictions, email encryption, and multi-factor authentication — while noting UpGuard’s Breach Risk product can identify exposed email protocol ports and advise remediation.