You enable SMTP routing to destinations within the local Internet domain separately from SMTP routing to external destinations. It is also possible to enable SMTP routing on a server without enabling the Listener task, and vice-versa.

For example, to support POP3 and IMAP clients, which use SMTP to send mail, you must have at least one internal server running the SMTP Listener task. However, the server does not have to use SMTP when transferring messages it receives over SMTP to the next hop on the routing path. After the server has accepted a message over SMTP, it can use Notes® routing to transfer the message to other servers.

By default, Domino uses Notes routing only and is not configured for SMTP routing. To have Domino use SMTP to send and receive mail, do the following:

• Prepare your system for sending messages to the Internet by testing your Internet connection and verifying that DNS is set up properly.
• Enable the SMTP Listener task in the Server document of each server you want to receive mail over SMTP
• Enable SMTP routing within the local Internet domain so that servers can send mail over SMTP within the local Internet domain.
• Enable SMTP to be used to send messages outside the local Internet domain.
• Specify the relay host, if any, to be used when sending mail outside the local Internet domain. Configure a relay host for SMTP servers that do not have direct access to the Internet.
• Set up inbound and outbound mail restrictions to protect against misuse of the mail infrastructure.
• To allow POP3 or IMAP users who connect to Domino from an external network to send mail to external Internet domains, specify exceptions to inbound relay enforcement for authenticated users.

Related concepts
Planning a mail routing topology
Customizing SMTP Routing
Overview of routing mail using SMTP
The POP3 service
The IMAP service

Related tasks
Preparing to send and receive mail to the Internet
Enabling a server to receive mail sent over SMTP routing
Setting up SMTP routing within the local Internet domain
Setting up SMTP routing to external Internet domains
Configuring Domino to send mail to a relay host or firewall
Specifying enforcement of inbound relay controls
Creating a Configuration Settings document
Setting up Notes routing

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