Index: wp-includes/pluggable.php
===================================================================
--- wp-includes/pluggable.php	(Revision 28512)
+++ wp-includes/pluggable.php	(Arbeitskopie)
@@ -275,6 +275,15 @@
 			// Explode the headers out, so this function can take both
 			// string headers and an array of headers.
 			$tempheaders = explode( "\n", str_replace( "\r\n", "\n", $headers ) );
+			
+			// Line which starts with space is a continuation of previous line, need to keep them as one
+			for ($index = 0; $index < count($tempheaders); $index ++) {
+			  if ($index > 0 && $tempheaders[$index] && $tempheaders[$index][0] === ' ') {
+			    $tempheaders[$index - 1] .= "\n" . $tempheaders[$index];
+			    array_splice($tempheaders, $index, 1);
+			    $index--;
+			  }
+			}
 		} else {
 			$tempheaders = $headers;
 		}
@@ -308,6 +317,9 @@
 							$from_name = substr( $content, 0, strpos( $content, '<' ) - 1 );
 							$from_name = str_replace( '"', '', $from_name );
 							$from_name = trim( $from_name );
+							if (function_exists('mb_decode_mimeheader')):
+							  $from_name = mb_decode_mimeheader($from_name);
+							endif;
 
 							$from_email = substr( $content, strpos( $content, '<' ) + 1 );
 							$from_email = str_replace( '>', '', $from_email );