Port 143 TCP UDP
Internet Message Access Protocol (IMAP) management of email messages
IMAP is a protocol used for the management of eMail storage on a mail server, it is commonly used by an email user/client to view, access and edit the messages on the remote server, and emulate an experience of the message actually been stored locally on the end user’s computer.
The protocol is now commonly used as an alternative to the POP3 protocol, as it is substantially more feature rich, as POP3 would download the eMail onto the client’s devices, making the state between a client’s different devices substantially harder to synchronize.
Client will typically still used IMAP with another protocol SMTP, which handles the submitting/sending of emails from the client to the mail server for onward delivery.
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