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单选题
Sendmail是一种（）。
A
MTA（Mail Transfer Agent）
B
MDA（Mail Delivery Agent）
C
MMA（Mail Man Agent）
D
MUA（Mail User Agent）
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/etc/named.confB
/etc/mail/sendmail.cfC
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考题
单选题What is the proper way to refresh sendmail？（）A
sendmail -btB
sendmail -baC
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考题
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