woocommerce_email_headers

apply_filters('woocommerce_email_headers') is found 5 times:

• /includes/class-wc-emails.php line 707

  		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 741

  		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 779

  		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 468

  		} elseif ( $this->get_from_address() && $this->get_from_name() ) {
  			$header .= 'Reply-to: ' . $this->get_from_name() . ' <' . $this->get_from_address() . ">\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

  	 * @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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