Which of the following is true regarding the command sendmail?
A. With any MTA, the sendmail command must be run periodically by the cron daemon.
B. When using systemd, sendmail is an alias to relayctl.
C. The sendmail command prints the MTA’s queue history of which mails have been sent successfully.
D. It is only available when the sendmail MTA is installed.
E. All common MTAs, including Postfix and Exim, provide a sendmail command.
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