Fix: problem with inline image with Mac

htdocs/lib/CMailFile.class.php

@@ -675,6 +675,7 @@ class CMailFile
         $strContent = rtrim(wordwrap($strContent));
 
 		$out.= $strContent.$this->eol;
+		$out.= $this->eol;
 
 		return $out;
 	}