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)