n important civil cases, sometimes a lawyer WILL serve another. Many things like "We compell you to present" or "deuces tecum materials" are often served by an attorney in public so the other side is publically made aware. It can be embarrasing but hey, its our system.
Normally subpeonas can be served by these messengers or even by registered mail.
I was served by some yokel in a pickup once for an important case between my client and several partners. It was all a bullshit game of chess among rich guys who were attempting just to **** each other over peanuts. The subpoena server actually driove into my garden when he saw me at home