False. sendmail can also be run as a Mail User Agent.
A2:
False. The sendmail configuration file needs to be recreated with additional FEATURES to reject email from spammers.
A3:
False. Any newly created mail aliases are stored in /etc/mail/aliases.db . The file /etc/mail/aliases is simply a text version used by administrators to update the binary /etc/mail/aliases.db file.
A4:
False. sendmail simply removes the name from the From: line in the message. The SMTP header will still contain the name of the machine that sent the email.
A5:
False. Simply create the /etc/mail/sendmail.st file with ownership/permissions of root/600 . Once created, we can use the mailstats command to monitor the quantity of emails being sent/received.