LPIC-1 Essential System Services and Networking Practice Question
A mail server using Postfix is rejecting emails from a partner domain. The administrator checks the maillog and sees 'relay access denied'. Which Postfix configuration parameter is most likely misconfigured?
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
✓
mynetworks
(mynetworks) is correct because it defines which client IP addresses are allowed to relay mail through the server. The 'relay access denied' error indicates that the partner domain's mail server is not in the trusted network list. Option A (mydestination) specifies local destination domains, not relay permissions. Option B (inet_interfaces) controls listening interfaces. Option C (relayhost) sets the next-hop relay for outbound mail. Therefore, mynetworks is the likely misconfiguration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
mydestination
Why it's wrong here
mydestination specifies domains for which this server accepts mail.
- ✗
inet_interfaces
Why it's wrong here
inet_interfaces defines network interfaces to listen on.
- ✗
relayhost
Why it's wrong here
relayhost is for forwarding all outgoing mail.
- ✓
mynetworks
Why this is correct
mynetworks specifies IP ranges allowed to relay.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 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-1 exam.