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メールが送信できない

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先週まで普通に受信・送信できていたのですが、急に送信だけできなくなりました。 受信はできます。 送信しようとすると添付のようなエラーメッセージが出てきます。 対処法を教えてください。 Windows10 Thunderbird のバージョン 78.4.0(32ビット)

先週まで普通に受信・送信できていたのですが、急に送信だけできなくなりました。 受信はできます。 送信しようとすると添付のようなエラーメッセージが出てきます。 対処法を教えてください。 Windows10 Thunderbird のバージョン 78.4.0(32ビット)
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