status code 550- Mailbox unavailable.. server response was: 5.7.1 UNABLE TO RELAY on Edge Server...
SMTP Email Error 550 5.7.1 - How to Resolve [SOLVED]
550 認証 - 配信不能なメール
修正: Outlook 電子メール アプリでサーバーが 550 エラーに応答しました
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SMTP Email Error 550 5.1.1 - How to Resolve [SOLVED]
電子メール エラー: リモート サーバーが「550 5.7.520 アクセスが拒否されました」を返しました。
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