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IMAP IDLE

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In e-mail technology, IDLE is an IMAP feature described in RFC 2177 that allows a client to indicate to the server that it is ready to accept real-time notifications.

Significance

The IDLE feature is significant from an engineering point of view for the reason that it allows IMAP e-mail users to see immediately any mailbox changes without having to undertake any action (eg clicking on a Refresh button).

Usage

IMAP4 servers that support IDLE will include this string in the result of their CAPABILITY command.