"Don't Shoot the Messenger" is a side mission you get in Borderlands: The Pre-Sequel.
This mission is found off the corpse of a dead person in Tycho's Ribs. This is just to the right of the shield busting gun:
Contents
Objectives[edit]
Turn in: Brittania
Description[edit]
Deliver the mysterious message.
Locations[edit]
NPCs[edit]
Enemies[edit]
Mission Briefing[edit]
Deliver a strange and mysterious message.
Mission Debriefing[edit]
Message has been received, loud and clear.
Reward[edit]
Money, XP and Fremington's Edge.