Yes, our servers support the IMAP IDLE feature for e-mail.
IMAP IDLE enables servers to push notifications to e-mail client applications in real-time. For example, instead of an e-mail client occasionally querying the server to check if there are any new messages, with IMAP IDLE the server simply sends a notification to the client immediately after a new message arrives. This enables users to receive almost instantaneous notification of new messages and other changes to their mailbox.
For more information about the IMAP IDLE feature, please visit https://tools.ietf.org/html/rfc2177.