LPIC-2 DNS, Web and Mail Services Practice Question
A mail administrator is configuring Postfix to use SASL authentication for incoming connections. Which THREE parameters must be set in main.cf?
⚠ Common exam trap
Many candidates confuse `smtpd_sasl_auth_enable` (server-side) with `smtp_sasl_auth_enable` (client-side), leading candidates to select the wrong parameter for incoming authentication.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
smtpd_sasl_security_options
B is correct because `smtpd_sasl_security_options` controls which SASL security mechanisms are allowed for the Postfix SMTP server (e.g., `noanonymous` to reject anonymous logins). This parameter is essential for enforcing authentication policy when SASL is enabled.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
smtpd_tls_auth_only
Why it's wrong here
This parameter forces authentication only over TLS but is not required for SASL.
- ✓
smtpd_sasl_security_options
Why this is correct
Specifies security options like noanonymous to reject anonymous logins.
- ✓
smtpd_sasl_auth_enable
Why this is correct
Enables SASL authentication for the SMTP server (incoming).
- ✗
smtp_sasl_auth_enable
Why it's wrong here
This parameter enables SASL for outgoing mail, not incoming.
- ✓
broken_sasl_auth_clients
Why this is correct
Enables support for clients that use outdated SASL mechanisms.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-2 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-2 exam.