The case of the day is Whoop, Inc. v. Serinity Group (D. Mass. 2026). The case is, in a sense, routine, but I wanted to write about it because it’s a Massachusetts decision, because I like the “Whoop” company name, and because it illustrates a couple of familiar but still useful points about service by email.

Whoop, the Boston-based manufacturer of fitness wristbands, sued Serinity, a French company that did business as Aurora, for trade dress infringement, seeking damages and an injunction under the Lanham Act, common law, and Mass. Gen. Laws c. 93A, our statute on unfair and deceptive acts or practices in trade or commerce.

Whoop first sought to serve process on Serinity via a huissier, who tried to make service at the French company’s registered address, but who reported that the company was no longer at that address. Whoop then sought leave to serve process by email, and the court obliged.

Seeking to serve process by huissier was appropriate and in fact a good way to go. France has not objected to service by alternate means under Article 10 of the Service Convention. Thus the Convention permitted Whoop to attempt service “directly through the judicial officers, officials or other competent persons of the State of destination.” A huissier is undoubtedly the officer the drafters of Article 10 had in mind. And FRCP 4(f)(2)(A) authorizes service by the means prescribed by French law.

Once it became clear that Aurora’s physical address was unknown, the Convention had no further role to play. Under Article 1, the Convention simply doesn’t apply if the address of the person to be served is unknown. Some courts impose a duty of diligence here, but there’s no doubt Whoop satisfied whatever obligation of diligence it may have had by attempting service at the address Aurora had registered with the French authorities.

Thus the only issue was whether, under FRCP 4(f)(3), the court should, in its discretion, allow service by email. The judge said yes, since the email address to be used was published on Aurora’s website and Aurora used the website to take orders. The judge also observed that an earlier email sent to that address had not been returned as undeliverable, though I think that is a weak piece of evidence without more technical detail, as it relies on the assumption that Aurora is using a well-behaved email server.

Because France, unlike, say, China, has not made an Article 10 objection, it is worth pointing out that even if Aurora’s physical address were known, and even if the Convention therefore applied, service by email might nevertheless work. Your view on that question will turn on whether you think that commercial email as we know it in 2026 is within the scope of the “postal channels” referred to in Article 10(a).