Identify Postfix's primary role on a Linux host.
Which description is correct?
Postfix is an MTA that accepts SMTP mail, queues it, routes it, and cooperates with local delivery.
Detailed explanation
Incorrect. Authoritative DNS zones are handled by DNS servers such as BIND.
Incorrect. Authoritative DNS zones are handled by DNS servers such as BIND.
Incorrect. systemd-journald stores the system journal.
Incorrect. systemd-journald stores the system journal.
Correct. Postfix is an SMTP mail transfer agent.
Correct. Postfix is an SMTP mail transfer agent.
Incorrect. ntpd or chronyd synchronize clocks.
Incorrect. ntpd or chronyd synchronize clocks.
Try it yourself
An example you can run in a temporary verification environment.
postconf mail_version 2>/dev/null || printf '%s
' 'Postfix: MTA'Expected result
Postfix versionまたはMTA確認文字列Key points
- MTA
- SMTP
- Queue and routing
Notes
- Environment: Postfix postconfがあれば読取のみ
- Command output formatting can vary slightly by distribution or tool version.
- Run the example in a temporary directory or process when possible.
Foundation review
Read the scope first
Check whether the command acts on the current shell, a new process, an existing process, or a file.
Verify the observable result
Use the supplied command and compare the output with the expected result.