ISC SSCP Question Answer
What works as an E-mail message transfer agent?
SMTP
SNMP
S-RPC
S/MIME
SMTP (Simple Mail Transfer Protocol) works as a message transfer agent.
Source: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, McGraw-Hill/Osborne, 2001, Page 821.
TESTED 08 Feb 2026
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