All 3 Uses of

correspond
in
The Poisonwood Bible

I turned the page on our lesson in business correspondence, and began to work on an elaborate pencil drawing of Noah's ark.
Chpt 3 *

correspondence = communication by writing letters

Right under Mobutu's nose, he discovered the writings of the great African nationalist Kwame Nkrumah, and the poetry of a young doctor in Angola, Agostinho Neto, with whom he started up a correspondence.
Chpt 5

Of course, Anatole's most faithful prison correspondence was with a nun in Bangassou, which was a matter of great hilarity to his fellow prisoners.
Chpt 5

Definitions:

(1) (correspond as in: corresponding time period)
connect or fit together by being equivalent, proportionate, or matched

(Two things are equivalent if they have the same or very similar value, purpose, or result.)
(2) (correspond as in: corresponding by email)
communicate -- typically by writing letters or email

A corresponding secretary is an officer of an organization who is responsible for managing the organization's correspondence and keeping a record of it.
(3) (correspondence as in: a correspondence course)
done from afar

For example, a corresponding member or a correspondence course.

This sense of corresponding arose because people who lived in distant cities and could not be present for meetings, could communicate by sending written communications.
(4) (correspondent as in: foreign correspondent of the paper)
a reporter or other representative -- typically from a foreign country or with a particular expertise