1

An ally has discovered something important.

2

An ally has sent a package containing an item.

3

An ally is in need of help.

4

It's an invitation to an event.

5

An enemy has issued an ultimatum.

6

It's personal correspondence from a friend or family member. May contain news from afar.

7

It's an official document from a government, church, or other organization.

8

An enemy gloats or taunts the player characters.

9

It's a hint or warning from an anonymous sender.

10

A stranger wishes to meet with the player characters.

11

It's a ruse intended to lure the player characters into a trap.

12

It's a love letter.