Inviting Friend was hacked, No Captcha showed.

Hi,

Recently there are many mail delivery system error reported from inviting friend module. It should be some hackers use inviting module from their own purposes.

After I enable captcha protection, a verification code label showed as in attachment. No input box or code display. What should I do?

So I have to disable inviting friend instead.

Please recommend,

Somkiat

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Below are mail errors returned back to my mail box. Should be from hackers.


This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

fatuvtl999789@gmail.com
host gmail-smtp-in.l.google.com [74.125.24.27]
SMTP error from remote mail server after RCPT TO:<fatuvtl999789@gmail.com>:
550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at
550 5.1.1 support.google.com/mail/?p=NoSuchUser j191si40847862pgc.15 - gsmtp

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This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

gnidbob895575@tomcom
The mail server could not deliver mail to gnidbob895575@tomcom. The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.

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This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

xtsrr@163.com
host 163mx03.mxmail.netease.com [220.181.14.160]
SMTP error from remote mail server after RCPT TO:<xtsrr@163.com>:
550 User not found: xtsrr@163.com