Configure Mobile Device App Support

Question 1

Describe IMAP and its port numbers

Answer 1

• Internet Message Access Protocol (IMAP)
• Inbound: used by a client to download an email stored on a mail server
• Email is kept on both server and client until deleted by client
• Redundant. Allows multiple user devices to access the email
• Unsecure port 143
• Secure port 993

Question 2

Describe SMTP and its port numbers

Answer 2

• Simple Mail Transfer Protocol (SMTP)
• Outbound: used to transfer an email from a client to a server and between mail servers
• Uses unsecure port 25
• Uses secure port 465

Question 3

What are the three primary protocols used for sending and receiving email?

Answer 3

• Post Office Protocol (POP)
• Internet Message Access Protocol (IMAP)
• Simple Mail Transfer Protocol (SMTP)

Question 4

Describe POP and its port numbers

Answer 4

• Post Office Protocol
• Inbound: used by a client to download an email stored on a mail server
• Once email is downloaded it is deleted from the server
• Not redundant. A user cannot access the same email on multiple devices
• IMAP is preferred
• Unsecure port 110
• Secure port 995