POP3(S) - IMAP(S)

Post Office Protocol

• Email Retrieval
• Download and delete from server
• Offline availability was a priority
• TCP 110 / TLS 995
  • If using TCP 110, this is gonna be in cleartext
• Delete can be optional
  • Maybe you want to leave the messages on the server to maintain a local copy
  • Depending on the configuration of the mail client/server

Internet Message Access Protocol

• Communication mechanism for checking (downloading email)
• Mail intended to be stored on server
• Synchronized between multiple clients
• Defined in RFC 4511
  • Anyone that wants to support this application it can
• Centralized AAA, as well as directory services.
  • IMAP server can do lookups on the centralized database
• TCP 143 / TLS 993
  • IMAP with TLS will run on port TCP 993

Mail Clients

• Microsoft Outlook
• Mozilla Thunderbird
• Apple Mail
• Microsoft Mail
  • Having it locally can be very handy if you want to look through your emails if you are offline
• Kerio
  • Third party program easier to use
  • Mail server
    • Email retrieval with POP3/IMAP
    • Send Email with SMTP(S)