An error occurred while trying to send the email. Could not instantiate mail function

the mails are not being sent after you click sent at the following url

http://www.r-sdesign.com/modx/index.php?id=6

Any help will be appreciated.

What are you using to send the mail? And what version of MODX are you using?


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PLEASE, PLEASE specify the version of MODX you are using . . . PLEASE!
MODX info for everyone: http://bobsguides.com/modx.html