Which port is traditionally used for SMTPS (SMTP over SSL)?

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

Multiple Choice

Which port is traditionally used for SMTPS (SMTP over SSL)?

Explanation:
SMTPS means SMTP with TLS starting as soon as the connection opens, so TLS is in place before any SMTP dialogue. This implicit TLS setup has long been associated with a dedicated port used for SMTPS, which is why this port is traditionally linked to SMTPS. The other ports serve different purposes: one is for submitting mail with TLS via STARTTLS after greeting, another is the standard SMTP port that can be plaintext or upgraded with STARTTLS, and the last is for retrieving mail (POP3), not SMTP. So the port tied to SMTPS—where TLS begins immediately on connect—is the traditional choice.

SMTPS means SMTP with TLS starting as soon as the connection opens, so TLS is in place before any SMTP dialogue. This implicit TLS setup has long been associated with a dedicated port used for SMTPS, which is why this port is traditionally linked to SMTPS. The other ports serve different purposes: one is for submitting mail with TLS via STARTTLS after greeting, another is the standard SMTP port that can be plaintext or upgraded with STARTTLS, and the last is for retrieving mail (POP3), not SMTP. So the port tied to SMTPS—where TLS begins immediately on connect—is the traditional choice.

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