The airport authority has a sparse page dedicated to mail services.
Both terminals have mail drop boxes beyond security screening. In Terminal One, the mailbox is located near the top of Concourse A. In Terminal Two, the mailbox is on the connector between Concourses C and D, near the Delta Sky Club.
The interactive terminal map didn’t seem to work on my computer, but the airport is walkable enough to where you should find either drop box within 15 minutes from any point post-security. Terminal A doesn’t directly connect to any other terminal; the drop box may be prior to any gates.
Stamps are available at post-security ATMs and at select newsstands.
No word on if the ATMs add a surcharge; the ATMs will most likely be books of “Forever” stamps for a one-ounce domestic letter.
Last updated 10 June 2017