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Regarding the issue of receiving error emails during the process of adding a sender email address in Gmail.

publication date :
Date of occurrence
-

Starting from Saturday, February 22, 2025, an issue has been occurring when following the procedure to add a sender email address in Gmail ( https://sites.google.com/kyoto-u.ac.jp/kumailstart/sendas ). If the email address being added belongs to a specific domain, an error email is returned when sending the verification email, preventing the sender email address from being added.

・Scope of Impact
Domains using Email Hosting services.

・Contents of the error email
メールの配信エラー xxxx@xxxx.kyoto-u.ac.jp へのメールの配信中に問題が発生しました。下記の詳細な技術情報をご確認ください。
リモート サーバーからの応答:
554 5.7.1 This email from IP xxx.xxx.xxx.xxx has been rejected. The email message was detected as spam.

 

The system was restored. We apologize for the inconvenience and trouble that you may have had.
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