单项选择题

A.smtpd_client_restrictions
B.smtpd_sender_restrictions
C.smtpd_recipient_restrictions
D.smtpd_helo_restrictions

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A.postconf
B.postconf -n
C.postconf -d
D.postconf -m

A./etc/init.d/network stop
B./etc/init.d/network start
C./etc/init.d/network restart
D.ifdown eth0；ifup eth0