Robot --> sending and signing the offer contract [PHP, AJAX]

This robot generates an offer contract and then sends it to the client to the mail he entered. About the proxy server. It is necessary that, in any case, the organs do not take the hole.
The letter itself contains the button of consent. If it is short.

In general, the following functionality and verification is implemented:
-Bot receives an email and checks if there is any such in the database?
If you eat soap, did the person agree before? If he agreed, he warns and wishes a pleasant cooperation.
If you have not yet agreed, you offer to send the contract again (no suddenly the person has lost)

Generates unique identifiers based on hashed soap + random sequence, records in the base of time, soap and whether a person has agreed.

Delivery of letters 10/10, SMTP authentication. Communications are signed.