Kindly edit your /vtiger-root/confing.inc.php and find go to line 39
You will see something like
$HELPDESK_SUPPORT_EMAIL_ID = 'support@web-berjaya.com';
$HELPDESK_SUPPORT_NAME = 'Web Berjaya Support';
$HELPDESK_SUPPORT_EMAIL_REPLY_ID = $HELPDESK_SUPPORT_EMAIL_ID;
Edit the variable value with your own value and save.
