Turn off rejection email

Turn off rejection email

We went live and users are  getting an email with the  subject line of:   

"Kindly raise your request  using the HelpDesk  application. Mail requests  are not allowed"

1. Is there a way to turn off  this notification?  I do not want tickets created by email, but dont want them sending a notification rejection email.

Also, why  is it sending to many people?   There was nothing in our  Google Apps inbox and a lot of users received this message.

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