dovecot の認証が "-ERR plaintext authentication disallowed on non-secure(ssl/tls)connections" エラーで失敗します

Solution Verified - Updated -

Issue

  • dovecot の認証が以下のエラーで失敗します。
-ERR plaintext authentication disallowed on non-secure(ssl/tls)connections

Environment

  • Red Hat Enterprise Linux 6
  • dovecot

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