CHAP 7.4 Mail Server

Question 1

mail user agent (email client)

Answer 1

provides user w ability to:

• read, reply or forward a msg to other ppl
• compose a new msg and send it to the desired recipients
• delete msgs

Question 2

mail transfer agent (MTA)

Answer 2

• transports emails to the recepients MTA
• communicate w one another using SMTP
• also known as SMTP servers
• forwards msg to a POP or IMAP service

Question 3

mail delivery agent (incoming mail server)

Answer 3

• stores email as it waits for user to accept it
• protected by user login acc and pwd
• use POP (port 110) and IMAP (port 143)

Question 4

how to secure an email

Answer 4

• sign an email msg to ensure its INTEGRITY and cfm the identity of its sender
• encrypt body of email msg to ensure CONFIDENTIALITY

Question 5

methods to secure email server and contents

Answer 5

1. malware scanner
   - use anti-virus or anti-spyware software
   - scan attachments
2. content filtering
   - scan email for specific contents and act on email based rules (delete email or hold large email for off-peak delivery)
3. block spam-sending servers
4. use authenticated mail relay (user authentication)