Overtly constructing an addressee (and implicitly constructing an addresser)

(in the sense Jakobson discussed when modeling communication)

Modes of address in the body of e-mail messages

• Dear Professor Varenne
• Herve
• Hi
• [none]

Modes of closing the body of e-mail messages

• Thanks,
• Best,
• Sincerely,
• LOL
• [none]

Note that, given a paradigm of choices among modes of address, any particular choice is, also, "poetic."

Practically, in 2013, check some meta-communicational discourse about addressing from Nick Bilton, who writes for the New York Times.