Enable Or Disable External Mail

Enable or disable external parties to send emails to a Microsoft 365 group

Description

This runbook configures whether external senders are allowed to email a Microsoft 365 group. It uses Exchange Online to enable or disable the RequireSenderAuthenticationEnabled setting. You can also query the current state without making changes.

Location

Group → Mail → Enable Or Disable External Mail

Full Runbook name

rjgit-group_mail_enable-or-disable-external-mail

Permissions

Application permissions

• Type: Office 365 Exchange Online

  • Exchange.ManageAsApp

RBAC roles

• Exchange administrator

Parameters

GroupId

Object ID of the Microsoft 365 group.

Property	Value
Required	true
Default Value
Type	String

Action

"Enable External Mail" (final value: 0), "Disable External Mail" (final value: 1) or "Query current state only" (final value: 2) can be selected as action to perform. If set to 0, the runbook will allow external senders to email the group. If set to 1, it will block external senders from emailing the group. If set to 2, it will return whether external mailing is currently enabled or disabled for the group without making any changes.

Property	Value
Required	false
Default Value	0
Type	Int32

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