Authenticating emails can be difficult due to the fact that most e-mail systems allow a person forwarding an e-mail to edit the message being forwarded. Such alteration wouldn't be discernible to the recipient. A few ways in which an email can be authenticated are affidavits, deposition of witnesses, or if the email came from a "unique" account such as a work email address that includes the company's domain, or a school email address (.edu).
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The best and cheapest way to authenticate your emails is to print them out and attached them as exhibits to your signed declaration in which you swear under the penalty of perjury that the exhibits are true and correct copies of the emails you received on so and so date, so and so time, from your email account email@example.com. This may or may not be sufficient for the court.
****The opinion above is not intended to be legal advice and absolutely does not create any attorney-client relationship between its author and the readers. Please consult an attorney for information or advice specific to your legal issue.**** Regal Law Office APC 21151 S. Western Ave. Suite 225 Torrance, CA 90501 310-212-7109