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fixing the fix, only set binary, if it has not content-transfer-encoding header with value base64
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@ -7326,8 +7326,11 @@ class Mail
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$structure->setTransferEncoding('8bit');
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$structure->setCharset('utf-8');
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}
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// if we have no text body, but only a PDF or an image, set binary, as it's already base64 transfer-encoded
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if ($structure->getType() === 'application/pdf' || $structure->getPrimaryType() === 'image')
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// if we have no text body, but only a PDF or an image AND transfer-encoding is NOT base64,
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// set binary, as it's already base64 transfer-encoded but lacks the necessary header
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if (($structure->getType() === 'application/pdf' || $structure->getPrimaryType() === 'image') &&
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// hack to read protected $structure->_transfer_encoding
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unserialize($structure->serialize())[9] !== 'base64')
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{
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$structure->setTransferEncoding('binary', ['send' => true]);
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}
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