Prevents a connection timeout.
KeepAlive is a procedure used to ensure that the POP3 protocol session remains open and valid.
KeepAlive sends the POP3 NOOP command to avoid a session timeout for the POP3 client. TIdPOP3 can use KeepAlive when performing time consuming operations, such as maintaining mail folders and messages on local file system, after the POP3 session has be started in Connect.
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