Error when sending mail

Not able to send mail to is coming....
how to check and where to check.
version is
Projeqtor : V6.0.4
MySQL : 5.6.31
Web Server is IIS
PHP Version is php-5.6.28-Win32-VC11-x86
Tried with PHP Version 5.3 also...
getting the same error.

What I did: -
written a sample phpmail page using mail() function like below and it works.
Tried with mail($to, $subject, $msg, $from, $headers);
php.ini file is configured with SMTP server address and port 25.
only from Projeqtor it is not going.
Can you help

below is the ajax request that is happening while clicking the send mail icon from the Projects Window.
http://localhost:81/projeqtor/tool/sendMail.php?className=Mailable&destinationWidth=48&destinationHeight=0&isIE=
Response is
<div class="messageERROR" >Not able to send mail to 'This email address is being protected from spambots. You need JavaScript enabled to view it.'.