About email restrictions for your enterprise
When you restrict email notifications, enterprise members can only use an email address in a verified or approved domain to receive email notifications about activity in organizations owned by your enterprise.
ノート: ドメインの承認は現在ベータであり、変更されることがあります。
The domains can be inherited from the enterprise or configured for the specific organization. For more information, see "Verifying or approving a domain for your enterprise" and "Restricting email notifications for your organization."
If email restrictions are enabled for an enterprise, organization owners cannot disable email restrictions for any organization owned by the enterprise. If changes occur that result in an organization having no verified or approved domains, either inherited from an enterprise that owns the organization or for the specific organization, email restrictions will be disabled for the organization.
Restricting email notifications for your enterprise
Before you can restrict email notifications for your enterprise, you must verify or approve at least one domain for the enterprise.
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GitHub Enterprise Serverの右上で、プロフィール写真をクリックし、続いてEnterprise settings（Enterpriseの設定）をクリックしてください。
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Enterpriseアカウントのサイドバーで、 Settings（設定）をクリックしてください。
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"Settings（設定）"の下で、Verified & approved domains（検証及び承認済みドメイン）をクリックしてください。
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Under "Notification preferences", select Restrict email notifications to only approved or verified domains.
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[Save] をクリックします。