30 Essex County. Commonwealth v. Adelson, 40 Mass. App. Ct. 585, 589 (1996).15 6. E-mail authentication. The defendants moved in limine on the first day of trial to exclude e-mail correspondence between Gail and Colton, arguing that the circumstances were insufficient to permit authentication or confirm Gail's identity as the sender. During voir dire on the issue, Colton testified that the defendants shared a joint e-mail account with which he had exchanged many friendly e-mails for nearly a decade. Regarding the proposed evidence, Colton testified that he understood these e-mails to be from Gail, on William's behalf, as they were sent after William had enlisted Colton in the scheme, were signed using Gail's typical signature, and referenced Colton's responses to inquiries about the harassment scheme.16 The judge ruled that the preponderance of the evidence authenticated the e-mails and laid a foundation for their admissibility. We agree. 15 As we are not reversing William's harassment conviction, there is no need to address his related argument that any "prejudicial spillover" from evidence introduced in support of that charge would require a new trial on the false report charge. 16 These inquiries included references to Craigslist postings, a telephone conversation between Colton and Gail, the Lyonses' personal identifying information, and "Mr. Meany," which Colton understood to be Gail's way of referencing Jim.