Manage mailbox mail flow settings

1. Transport Rules

Transport rules are a powerful feature that lets you apply specific actions to emails based on predetermined conditions. To create a transport rule, you can use the Exchange admin center or PowerShell. Transport rules allow you to enforce email policies, such as adding disclaimers, blocking specific message content, redirecting messages, or applying message encryption.

Example: This transport rule adds a disclaimer to all outgoing emails:

PowerShell
New-TransportRule -Name “Disclaimer Rule” -SentToScope “NotInOrganization” -ApplyHtmlDisclaimerText “This email is intended for recipients outside of the organization.”

2. Mail Flow Connectors

Mail flow connectors enable you to set up connections between your organization and external messaging systems or partners. These connectors define how email is routed between organizations, allowing you to control message flow and enforce security measures like encryption or secure transport. You can create connectors for specific domains or IP addresses.

Example: This example creates a mail flow connector for a specific domain:

PowerShell
New-OutboundConnector -Name “Partner Connector” -VerifyRecipientDomain “partner.com” -TlsSettingsForceTls

3. Message Delivery Restrictions

You can manage message delivery restrictions to control who can send emails to specific recipients or groups within your organization. By setting up delivery restrictions, you can limit the scope of internal communication or prevent unauthorized external senders from reaching specific recipients.

Example: To restrict email delivery to a particular recipient group, you can use the Exchange admin center. Select the group, go to Mail Flow Settings, and configure the delivery restrictions accordingly.

4. Accepted Domains

Accepted domains define the email domains for which your organization is willing to accept email messages. You can add and verify multiple domains, allowing you to receive emails for different domains within a single Microsoft 365 tenant.

Example: To add a new accepted domain, use the Exchange admin center or PowerShell:

PowerShell
New-AcceptedDomain -Name “example.com” -DomainName “example.com”

5. Email Address Policies

Email address policies help you define the email addresses assigned to recipients within your organization. By creating an email address policy, you can automate the process of assigning email addresses based on specific conditions, such as department, location, or role.

Example: This command creates a new email address policy that assigns email addresses based on the recipient’s department:

PowerShell
New-EmailAddressPolicy -Name “Departmental Email Addresses” -RecipientFilter {Department -eq ‘Sales’} -EnabledEmailAddressTemplates “SMTP:%g.%[email protected]”

These are just a few examples of how you can manage mailbox mail flow settings in Microsoft 365 Messaging. By leveraging these settings, you can ensure efficient mail flow, enforce email policies, and maintain a secure messaging environment within your organization. Remember to refer to the official Microsoft documentation for detailed instructions on each configuration option.