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エラーメッセージ "SMTPUTF8 is required, but was not offered by host" が表示されてメール送信に失敗する

Solution In Progress - Updated -

Issue

  • エラーメッセージ "SMTPUTF8 is required, but was not offered by host" が表示されてメール送信に失敗します。

Environment

  • Red Hat Enterprise Linux 8
  • postfix-3.3.1-8 以降

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