diff --git a/src/wp-includes/pluggable.php b/src/wp-includes/pluggable.php
index 0ed2609d40..3058986ab6 100644
--- a/src/wp-includes/pluggable.php
+++ b/src/wp-includes/pluggable.php
@@ -308,10 +308,10 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 	}
 
 	// Empty out the values that may be set
-	$phpmailer->ClearAllRecipients();
-	$phpmailer->ClearAttachments();
-	$phpmailer->ClearCustomHeaders();
-	$phpmailer->ClearReplyTos();
+	$phpmailer->clearAllRecipients();
+	$phpmailer->clearAttachments();
+	$phpmailer->clearCustomHeaders();
+	$phpmailer->clearReplyTos();
 
 	// From email and name
 	// If we don't have a name from the input headers
@@ -410,7 +410,7 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 	}
 
 	// Set to use PHP's mail()
-	$phpmailer->IsMail();
+	$phpmailer->isMail();
 
 	// Set Content-Type and charset
 	// If we don't have a content-type from the input headers
@@ -430,7 +430,7 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 
 	// Set whether it's plaintext, depending on $content_type
 	if ( 'text/html' == $content_type )
-		$phpmailer->IsHTML( true );
+		$phpmailer->isHTML( true );
 
 	// If we don't have a charset from the input headers
 	if ( !isset( $charset ) )
@@ -450,17 +450,17 @@ function wp_mail( $to, $subject, $message, $headers = '', $attachments = array()
 	// Set custom headers
 	if ( !empty( $headers ) ) {
 		foreach ( (array) $headers as $name => $content ) {
-			$phpmailer->AddCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) );
+			$phpmailer->addCustomHeader( sprintf( '%1$s: %2$s', $name, $content ) );
 		}
 
 		if ( false !== stripos( $content_type, 'multipart' ) && ! empty($boundary) )
-			$phpmailer->AddCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) );
+			$phpmailer->addCustomHeader( sprintf( "Content-Type: %s;\n\t boundary=\"%s\"", $content_type, $boundary ) );
 	}
 
 	if ( !empty( $attachments ) ) {
 		foreach ( $attachments as $attachment ) {
 			try {
-				$phpmailer->AddAttachment($attachment);
+				$phpmailer->addAttachment($attachment);
 			} catch ( phpmailerException $e ) {
 				continue;
 			}