:1. Why did you get “command not recognized” as the output for the EXPN command? :2. What does the VRFY command ask Postfix to do? :3. How do you add a mailing list called “helpdesk” on your Postfix VM so that all email send to the “helpdesk”mail list will be forwarded to user ldapuser1? :4. Would you be able to nc from your other virtual machines to the SMTP port on your VM3 and repeat the task in investigaion investigation 1 step (15)? If not, what would you need to change on your Postfix server to allow other machines to connect to the Postfix mail server? :5. Who is the owner of the file /tmp/ops535.mail? :6. Who has the read permission on the file /tmp/ops535.mail? :7. What is the "Return Path" indicated in the file /tmp/ps535.mail? :8. What command will peform perform the same function as "/usr/sbin/sendmail -bi" ? :9. What is the absolute path and access permission of the directory used by Postfix to store outgoing messages? :10.What command would you use to get a Mail Delivery Status Report? :11. What command will show you the queue ID of an outgoing email waiting for deliery delivery in the mail queue? :12.How do you delete an outgoing message which is sitting in the queue directory?