To configure the authenticated SMTP settings that are used by POP3 and IMAP4 clients, perform the following steps:Ĭonfigure the FQDN on the 'Client Frontend ' Receive connector. Note that this is opportunistic TLS ( STARTTLS) that results in an encrypted connection after the initial plain text protocol handshake.įor more information, see Default Receive connectors created during setup and Client access protocol architecture.
By default, this connector uses the following settings for internal and external client (authenticated) SMTP connections:
The default Receive connector named 'Client Frontend ' in the Client Access services on the Mailbox server listens for authenticated SMTP client submissions on port 587.
After you enable and configure POP3 or IMAP4 on an Exchange server as described in Enable and configure POP3 on an Exchange server and Enable and configure IMAP4 on an Exchange server, you need to configure the authenticated SMTP settings for POP3 and IMAP4 clients so they can send email messages.
