Legal Question in Civil Litigation in California

With a declaration sworn under oath in which you state you have personal knowledge that the email address is your regular email address and that you sent the email. You would also want to state that you have personal knowledge that the email address he used to respond is the one he has used to communicate with you before.

If you really want to be sure, subpoena records related to his email account from gmail or yahoo or whereever.

This email response has been prepared for informational purposes only. Nothing herein is intended as legal advice. You should not rely upon any information in this email as a source of legal advice, and receipt of any such information by you does not create an attorney-client relationship between you and Law Office of Jacob I. Kiani or Jacob I. Kiani, Esq.

In addition to what Mr. Kiani has said, if you're in trial, you could and should testify that you sent the e-mail to him and received the response, or vice versa. If you have the e-mail in your smart phone, bring it with you.