SMTP
Simple Mail Transfer Protocol
Domain 3: Security Architecture
Protocol for sending email. Uses port 25 (unencrypted), 587 (submission with TLS), or 465 (SMTPS).
Exam Tip
SMTP = sending email (port 25/587). POP3/IMAP = receiving email (110/143 or 995/993).
Related Terms
POP3
IMAP
Email Security