As a convenience to users who are not always able to check messages by phone or from the Cisco Unity Connection Web Inbox, you can enable users to use an IMAP client application on their computers to access voice messages. When an authorized IMAP client tries to send a message to Connection through SMTP, Connection attempts to categorize the message as a voice mail, email, fax, or delivery receipt. Connection also attempts to map the sender to a user and the message recipients to users or contacts by comparing the SMTP addresses in the message header to its list of SMTP proxy addresses.