ITPEC FE Morning April 2021 Question 44
ITPEC FE Morning April 2021 — Question 44 of 80
OP25B (Outbound Port 25 Blocking) — ISP blocks outbound traffic to port 25 to prevent spam.
What it does:
- ISPs block direct SMTP connections (port 25) from end users
- Forces users to send email through the ISP's authorized mail server
- Prevents compromised machines from sending spam directly
Why not others:
- (b) Blocking emails to 25+ recipients — organizational policy, unrelated to OP25B
- (c) Blocking SMTP except to port 25 — opposite of what OP25B does; it blocks port 25
- (d) Blocklisting spam addresses — that's DNSBL/RBL, a different anti-spam mechanism
Key rule: OP25B = the name is the definition. Outbound Port 25 Blocking.
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