New-OutboundConnector

The AllAcceptedDomains parameter specifies whether the Outbound connector is used in hybrid organizations where message recipients are in accepted domains of the cloud-based organization. Valid values are:

• $true: The Outbound connector is used in hybrid organizations when message recipients are in an accepted domain of the cloud-based organization. This setting requires OnPremises for the ConnectorType value.
• $false: The Outbound connector isn't used in hybrid organizations. This is the default value.

This parameter is effective only for OnPremises connectors.

Note: We recommend that you don't use this parameter unless you are directed to do so by Microsoft Customer Service and Support, or by specific product documentation. Instead, use the Hybrid Configuration wizard to configure mail flow between your on-premises and cloud organizations. For more information, see Hybrid Configuration wizard.

The CloudServicesMailEnabled parameter specifies whether the connector is used for hybrid mail flow between an on-premises Exchange environment and Microsoft 365. Specifically, this parameter controls how certain internal X-MS-Exchange-Organization-* message headers are handled in messages that are sent between accepted domains in the on-premises and cloud organizations. These headers are collectively known as cross-premises headers.

Valid values are:

• $true: The connector is used for mail flow in hybrid organizations, so cross-premises headers are preserved or promoted in messages that flow through the connector. This is the default value for connectors that are created by the Hybrid Configuration wizard. Certain X-MS-Exchange-Organization-* headers in outbound messages that are sent from one side of the hybrid organization to the other are converted to X-MS-Exchange-CrossPremises-* headers and are thereby preserved in messages. X-MS-Exchange-CrossPremises-* headers in inbound messages that are received on one side of the hybrid organization from the other are promoted to X-MS-Exchange-Organization-* headers. These promoted headers replace any instances of the same X-MS-Exchange-Organization-* headers that already exist in messages.
• $false: The connector isn't used for mail flow in hybrid organizations, so any cross-premises headers are removed from messages that flow through the connector.

The Comment parameter specifies an optional comment. If you specify a value that contains spaces, enclose the value in quotation marks ("), for example: "This is an admin note".

The Confirm switch specifies whether to show or hide the confirmation prompt. How this switch affects the cmdlet depends on if the cmdlet requires confirmation before proceeding.

• Destructive cmdlets (for example, Remove-* cmdlets) have a built-in pause that forces you to acknowledge the command before proceeding. For these cmdlets, you can skip the confirmation prompt by using this exact syntax: -Confirm:$false.
• Most other cmdlets (for example, New-* and Set-* cmdlets) don't have a built-in pause. For these cmdlets, specifying the Confirm switch without a value introduces a pause that forces you acknowledge the command before proceeding.

The ConnectorSource parameter specifies how the connector is created. Valid values are:

• Default: The connector is manually created. This is the default value when you use this cmdlet, and we recommend that you don't change this value.
• HybridWizard: The connector is automatically created by the Hybrid Configuration Wizard.
• Migrated: The connector was originally created in Microsoft Forefront Online Protection for Exchange.

The ConnectorType parameter specifies a category for the domains that are serviced by the connector. Valid values are:

• Partner: The connector services domains that are external to your organization.
• OnPremises: The connector services domains that are used by your on-premises organization.

The Enabled parameter specifies whether to enable or disable the Outbound connector. Valid values are:

• $true: The connector is enabled. This is the default value.
• $false: The connector is disabled.

The IsTransportRuleScoped parameter specifies whether the Outbound connector is associated with a transport rule (also known as a mail flow rule). Valid values are:

• $true: The connector is associated with a transport rule.
• $false: The connector isn't associated with a transport rule. This is the default value.

You scope a transport rule to an Outbound connector by using the RouteMessageOutboundConnector parameter on the New-TransportRule or Set-TransportRule cmdlets. Messages that match the conditions of the transport rule are routed to their destinations by using the specified Outbound connector.

This parameter is reserved for internal Microsoft use.

The Name parameter specifies the unique name for the connector. The maximum length is 64 characters. If the value contains spaces, enclose the value in quotation marks (").

The RecipientDomains parameter specifies the domains that the Outbound connector routes mail to. You can specify multiple domains separated by commas.

You can use a wildcard character to specify all subdomains of a specified domain, as shown in the following example: *.contoso.com. However, you can't embed a wildcard character, as shown in the following example: domain.*.contoso.com.

The RouteAllMessagesViaOnPremises parameter specifies that all messages serviced by this connector are first routed through the on-premises email system in hybrid organizations. Valid values are:

• $true: Messages are routed through the on-premises email system. This setting requires OnPremises for the ConnectorType value.
• $false: Messages aren't routed through the on-premises email system. This is the default value.

This parameter is effective only for OnPremises connectors.

The SenderRewritingEnabled parameter specifies that all messages that normally qualify for SRS rewriting are rewritten for routing through the on-premises email system. Valid values are:

• $true: Messages are rewritten by SRS as needed before being routed through the on-premises email system. This setting requires OnPremises for the ConnectorType value.
• $false: Messages aren't rewritten by SRS before being routed through the on-premises email system. This is the default value.

This parameter is effective only for OnPremises connectors.

The SmartHosts parameter specifies the smart host that the Outbound connector uses to route mail. Valid values are:

• FQDN of a smart host server, a mail exchange (MX) record, or an address (A) record: For example, mail.contoso.com.
• Single IP address: For example, 10.10.1.1.
• Classless InterDomain Routing (CIDR) IP address range: For example, 192.168.0.1/25.

You can specify multiple value separated by commas: "Value1","Value2",..."ValueN".

This parameter is required if you use the value $false for the UseMxRecord parameter.

The TestMode parameter specifies whether you want to enabled or disable test mode for the Outbound connector. Valid values are:

• $true: Test mode is enabled.
• $false: Test mode is disabled. This is the default value.

The TlsDomain parameter specifies the domain name that the Outbound connector uses to verify the FQDN of the target certificate when establishing a TLS secured connection. A valid value for this parameter is an SMTP domain.

Wildcards are supported to specify all subdomains of a domain (for example, *.contoso.com), but you can't embed the wildcard character within the domain (for example, domain.*.contoso.com).

This parameter meaningful only when the TlsSettings value is DomainValidation.

The TlsSettings parameter specifies the TLS authentication level that's used for outbound TLS connections established by this Outbound connector. Valid values are:

• EncryptionOnly: TLS is used only to encrypt the communication channel. No certificate authentication is performed.
• CertificateValidation: TLS is used to encrypt the channel and certificate chain validation and revocation lists checks are performed.
• DomainValidation: In addition to channel encryption and certificate validation, the Outbound connector also verifies that the FQDN of the target certificate matches the domain specified in the TlsDomain parameter.
• $null (blank): This is the default value.

The UseMXRecord parameter enables or disables DNS routing for the connector. Valid values are:

• $true: The connector uses DNS routing (MX records in DNS) to deliver email. This is the default value.
• $false: The connector delivers email to one or more smart hosts. This setting requires one or more smart hosts for the SmartHosts value.

The WhatIf switch simulates the actions of the command. You can use this switch to view the changes that would occur without actually applying those changes. You don't need to specify a value with this switch.