Planning mail routing and mail settings

Which servers will function as your mail hub servers in the on-premises hub domain?

Mail hub servers in the on-premises hub domain handle the routing of all mail that service users send to on-premises users and devices. The servers must have sufficient hardware and network resources to handle this mail routing load.

If service users send mail to on-premises users who are registered in a different domain than the on-premises hub domain, the mail hub servers in the on-premises hub domain must be able to route mail to the other domains.

You can use one or two mail hub servers. Use two for high availability. For pilot deployments, one mail hub server might suffice.

Mail hub servers in the on-premises hub domain must be certified under the same parent organization certifier as your directory synchronization servers, passthru servers, and user mail servers in the service.

Public key checking must be disabled on the mail hub servers in the on-premises hub domain. For more information, see the topic

For more information, see Setting up mail hub servers in the on-premises hub domain.

Do you need to upgrade any mail servers?

Mail hub servers in each Domino domain in which service users are registered handle routing mail from your on-premises environment to the service users in the domain.

Each on-premises server that routes mail to the service must run Domino 8.5.1 Fix Pack 2 or a later version.

What Internet domains do you want to define in the service?

You use at least one Global Domain document to define the Internet domains that your company owns and that you want to use in the service. Global Domain documents replicate to the service during directory synchronization. The service uses Global Domain documents only to determine the domains that a company owns.

As part of service configuration, you will verify ownership of the domains specified in Global Domain documents. Verification involves creating a CNAME record in your domain DNS record. If you don’t have access to the DNS record, you will need to allow time for your Internet Service Provider (ISP) to create the required CNAME record for you

You can route mail between service users and on-premises users or devices in foreign domains not associated with Domino mail servers. To define a foreign domain, you must create a Global Domain document in a new Domino directory that is not the primary Domino Directory of a Domino domain.

For more information, see the topics Preparing Global Domain documents and Verifying Internet domains.

Do you use Internet domain aliases in Global Domain documents?

Domains specified in the Global Domain document field Alternate Internet domain aliases are not handled as alias domains by the service. Instead, each domain in this field is listed and verified in the service as a separate domain, similar to the domain specified in the Local primary Internet domain field. To enable a user to receive mail addressed to a domain in the Alternate Internet domain aliases field, you must specify the user’s address for the domain in the Person document.

For more information, see Adding multiple Internet email addresses to Person documents.

When service users send mail to external users on the Internet, do you want to use an on-premises SMTP server to route the mail?

By default, the service routes mail that service users address to external users. You can use a company-controlled SMTP server to route the mail, instead. When you use your own server, you can perform actions such as filtering and auditing before routing the mail. For more information, see the topic Preparing to use a company SMTP server to route outbound Internet mail

You are responsible for routing inbound SMTP mail that is addressed to service users. The mail must be routed to a mail hub server in the Domino domain in which the service user is registered.

Do you want to use any of the optional mail settings the service provides?

You can limit the size of incoming messages, prevent auto-forwarding of external messages, customize the display of IBM Notes® document links in web client mail, configure mail retention in the trash folder, and control the deletion of older email. For more information, see Configuring mail settings