Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(revision 4283)
+++ wp-includes/pluggable.php	(working copy)
@@ -161,9 +161,9 @@
 if ( !function_exists('wp_mail') ) :
 function wp_mail($to, $subject, $message, $headers = '') {
 	if( $headers == '' ) {
-		$headers = "MIME-Version: 1.0\n" .
-			"From: wordpress@" . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME'])) . "\n" . 
-			"Content-Type: text/plain; charset=\"" . get_option('blog_charset') . "\"\n";
+		$headers = 'MIME-Version: 1.0\n' .
+			'From: "' . sanitize_email(get_option('blogname')) . '" <wordpress@' . preg_replace('#^www\.#', '', strtolower($_SERVER['SERVER_NAME'])) . '>\n' . 
+			'Content-Type: text/plain; charset="' . get_option('blog_charset') . '"\n';
 	}
 
 	return @mail($to, $subject, $message, $headers);