Don't add MIME-Version header twice (PHPMailer already adds it). see #4296
git-svn-id: https://develop.svn.wordpress.org/trunk@5763 602fd350-edb4-49c9-b593-d223f7449a82
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@ -170,11 +170,9 @@ function wp_mail( $to, $subject, $message, $headers = '' ) {
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// Compact the input, apply the filters, and extract them back out
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// Compact the input, apply the filters, and extract them back out
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extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers' ) ), EXTR_SKIP );
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extract( apply_filters( 'wp_mail', compact( 'to', 'subject', 'message', 'headers' ) ), EXTR_SKIP );
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// Default headers
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// Headers
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if ( empty( $headers ) ) {
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if ( empty( $headers ) ) {
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$headers = array(
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$headers = array();
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'MIME-Version' => '1.0'
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);
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} elseif ( !is_array( $headers ) ) {
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} elseif ( !is_array( $headers ) ) {
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// Explode the headers out, so this function can take both
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// Explode the headers out, so this function can take both
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// string headers and an array of headers.
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// string headers and an array of headers.
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