noun
email authentication; email validation
Technical term for verifying the identity of an email sender or the validity of an email address, often used in IT security contexts.
このサービスでは、メール認証が必要です。
This service requires email authentication.
メール認証の設定を確認してください。
Please check the email authentication settings.
Compound of メール (email, from English 'mail') and 認証 (authentication).