woocommerce_email_headers

apply_filters('woocommerce_email_headers') is found 5 times:

• /includes/class-wc-emails.php line 778

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  wp_mail(         apply_filters( 'woocommerce_email_recipient_low_stock', get_option( 'woocommerce_stock_email_recipient' ), $product, null ),         apply_filters( 'woocommerce_email_subject_low_stock', $subject, $product, null ),         apply_filters( 'woocommerce_email_content_low_stock', $message, $product ),         apply_filters( 'woocommerce_email_headers', '', 'low_stock', $product, null ),         apply_filters( 'woocommerce_email_attachments', array(), 'low_stock', $product, null )     ); }   /**  * No stock notification email.

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• /includes/class-wc-emails.php line 812

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  wp_mail(         apply_filters( 'woocommerce_email_recipient_no_stock', get_option( 'woocommerce_stock_email_recipient' ), $product, null ),         apply_filters( 'woocommerce_email_subject_no_stock', $subject, $product, null ),         apply_filters( 'woocommerce_email_content_no_stock', $message, $product ),         apply_filters( 'woocommerce_email_headers', '', 'no_stock', $product, null ),         apply_filters( 'woocommerce_email_attachments', array(), 'no_stock', $product, null )     ); }   /**  * Backorder notification email.

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• /includes/class-wc-emails.php line 850

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  wp_mail(         apply_filters( 'woocommerce_email_recipient_backorder', get_option( 'woocommerce_stock_email_recipient' ), $args, null ),         apply_filters( 'woocommerce_email_subject_backorder', $subject, $args, null ),         apply_filters( 'woocommerce_email_content_backorder', $message, $args ),         apply_filters( 'woocommerce_email_headers', '', 'backorder', $args, null ),         apply_filters( 'woocommerce_email_attachments', array(), 'backorder', $args, null )     ); }   /**  * Adds Schema.org markup for order in JSON-LD format.

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• /includes/emails/class-wc-email.php line 580

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  $header .= 'Bcc: ' . sanitize_text_field( $bcc ) . "\r\n";         }     }       return apply_filters( 'woocommerce_email_headers', $header, $this->id, $this->object, $this ); }   /**  * Get email attachments.  *  * @return array

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• /src/Internal/Admin/Notes/EmailNotification.php line 100

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  * @return string  */ public function get_headers() {     $header = 'Content-Type: ' . $this->get_content_type() . "\r\n";     return apply_filters( 'woocommerce_email_headers', $header, $this->id, $this->object, $this ); }   /**  * Get email subject.  *  * @return string

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