--- linkchecker.module.orig	2009-03-25 16:01:00.000000000 -0700
+++ linkchecker.module	2009-03-31 20:13:38.000000000 -0700
@@ -1171,6 +1171,9 @@ function _linkchecker_extract_links($tex
       // Add to Array and change HTML links into plain text links.
       $links[] = decode_entities($ret[$i]);
     }
+    // skip mailto:, javascript:, etc.
+    elseif (preg_match('/^\w[\w.+]*:/', $ret[$i]))
+      continue;
     // Local URLs.
     elseif (valid_url($ret[$i], FALSE)) {
       if (variable_get('linkchecker_fqdn_only', 1) == 0) {