Send email without reading confirmation

Hi experts,

I have an implementation in CRM 7.0. If a contract with special attributes is saved, in event management I trigger the sending of an email. This email is sent to a special email address and the sender email address is the one of the creating user.

Now, somehow have the effect, that if the recipient deletes or reads this system email, the user, who created the contract always gets an outlook reading confirmation or deleting information.

Does anybody has an idea how to suppress this reading and deletion information? I use the following standard class: cl_crm_email_data. I couldn't find a parameter to unable this setting.

Thanks in advance!

Best regards,

Mireille