SDCL § 53-12-33: Time that electronic record is sent.

Unless otherwise agreed between the sender and the recipient, an electronic record is sent when it:

(1) Is addressed properly or otherwise directed properly to an information processing system that the recipient has designated or uses for the purpose of receiving electronic records or information of the type sent and from which the recipient is able to retrieve the electronic record;

(2) Is in a form capable of being processed by that system; and

(3) Enters an information processing system outside the control of the sender or of a person that sent the electronic record on behalf of the sender or enters a region of the information processing system designated or used by the recipient which is under the control of the recipient.