/mcp• If the recipient maps to a user homed on a remote Unity Connection server, the message is relayed to the home server of the user that performs the action specified on the Message Actions page of the user profile. • If the recipient does not map to any of the above, Unity Connection either relays the message to the SMTP smart host or sends an NDR to the sender, depending on the option selected for the When a Recipient Cannot be Found setting on the System Settings > General Configuration page in Cisco Unity Connection Administration. By default, Unity Connection sends an NDR. If SMTP authentication is configured for the IMAP client and the SMTP address of the sender does not match a proxy address or the primary SMTP address for the authenticated user, the Unity Connection server returns an SMTP error that causes the message to remain in the client outbox. If SMTP authentication is not configured for the IMAP client and the SMTP address of the sender does not match any known user proxy address or primary SMTP address, Unity Connection places the message into the MTA bad mail folder (UmssMtaBadMail). Example Using IMAP and ViewMail for Outlook Consider an example of an organization ExampleCo. that uses Microsoft Outlook to access a Microsoft Exchange server for email. Each employee at the company receives corporate email at an address that follows the pattern firstname.lastname@example.com. ExampleCo wants employees to be able to use Outlook to access voice messages stored on the Unity Connection server. To allow employees to send, forward, or reply to voice messages in the Outlook client, ExampleCo deploys the Cisco Unity Connection ViewMail for Microsoft Outlook plugin. The Outlook client for each employee is configured to access the user account using IMAP. When Robin Smith at ExampleCo wants to send an email message to a coworker, Chris Jones, Robin composes a new email message to chris.jones@example.com. By default, Outlook is configured to route new email messages to the Microsoft Exchange server for delivery. Next, Robin wants to send Chris a voice message and selects the New Voice Message icon that opens the ViewMail for Outlook form. Robin again addresses the message to chris.jones@example.com, records audio for the message, and selects the Send button. The voice message is routed to Unity Connection for delivery because ViewMail is configured to use Unity Connection IMAP accounts to send the messages. When Unity Connection receives the voice message, it searches the list of SMTP proxy addresses for robin.smith@example.com (the sender) and chris.jones@example.com (the recipient). Unity Connection delivers the message as a voice message from Robin Smith to Chris Jones because these addresses are defined as SMTP proxy addresses for the user profiles of Robin Smith and Chris Jones respectively. When Chris opens Outlook, the email message from Robin shows up as a new message in the Microsoft Exchange Inbox. The voice message from Robin, on the other hand, shows up as a new message in the Inbox of the Unity Connection account that Chris accesses using IMAP. If Chris replies to either message, the Outlook client automatically route the reply using the account in which Chris received the original message. Important Points for Deploying Integrated Messaging Following are the considerations when deploying IMAP clients to send and receive Unity Connection messages: • Use a firewall to protect the SMTP port from unauthorized access. The SMTP port and domain are listed on the System Settings > SMTP Configuration > Server page in Cisco Unity Connection Administration. • Configure Transport Layer Security for IMAP client connections in order to protect user passwords. System Administration Guide 145 Messaging Example Using IMAP and ViewMail for Outlook