diff --git a/plugins/mailhandler/commands/MailhandlerCommandsDefault.class.php b/plugins/mailhandler/commands/MailhandlerCommandsDefault.class.php
index dc94f8c..670f9c6 100644
--- a/plugins/mailhandler/commands/MailhandlerCommandsDefault.class.php
+++ b/plugins/mailhandler/commands/MailhandlerCommandsDefault.class.php
@@ -129,7 +129,7 @@ class MailhandlerCommandsDefault extends MailhandlerCommands {
     // Collect the commands and locate signature.
     $lines = explode("\n", $string);
     foreach ($lines as $i => $line) {
-      preg_match('/^([a-zA-Z0-9_-\s\.]+):{1}\s+(.+)$/', $line, $matches);
+      preg_match('/^([a-zA-Z0-9_\-\s\.]+):{1}\s+(.+)$/', $line, $matches);
       if (count($matches) == 3) {
         $key = trim($matches[1]);
         $value = trim($matches[2]);