This issue was described on xoopscube.jp. I hurriedly created a patch.
All it does is check the user’s email address.
(1) The email is not an empty string
(2) The email is no more than 64 characters long
(3) The email is in a valid format (using the mojavi pattern)
(4) The email host can be resolved
Simply download it from here, copy it to modules/contact, and unzip it.
If you want the messages in English, change the include in index.php from natfj.php to natfe.php. That’s all.
P.S. I replaced it with a slightly revised version at AM 2:00, so if you downloaded it before then, please download it again.
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