Email for Payments

Hello,

Everytime we add a payment to and invoice it sends and email or many, and since we have clients that are delicate this is becoming and issue, is there a way to turn off emailing.

we already deleted the email on those costumers file, and bloced the reminder option.
but know it emails ourself with 5 emails at a time per invoice payment and is crashing our mailing server.

Any help !

Thanks in advance.

does anyone have any ideas?