--- /dev/null
+To fix #568360 and #568537, don't limit local part size.
+--- roundcube-0.3.1/program/include/main.inc~ 2009-10-31 14:44:19.751802878 +0100
++++ roundcube-0.3.1/program/include/main.inc 2010-02-05 19:46:12.000000000 +0100
+@@ -1427,7 +1427,7 @@
+ return false;
+
+ // Check that there's one @ symbol, and that the lengths are right
+- if (!preg_match('/^([^@]{1,64})@([^@]{1,255})$/', $email, $email_array))
++ if (!preg_match('/^([^@]+)@([^@]{1,255})$/', $email, $email_array))
+ return false;
+
+ // Check local part