Mail

Borderlands 3 has a mail system which allows players to receive items in-game. Rewards from the Borderlands 3 VIP program, pre-order bonuses, EchoCast rewards, and in-game bonuses are all sent to the player's mailbox. Mail is only accessible while playing, and trying to access it from the main menu with be met with an error message.

In-Game Rewards
The weapons manufacturers in Borderlands 3 reward users for brand loyalty. Whenever a player makes 100 kills using a company's weapons, they will receive a complimentary gun in the mail. Each gun comes with a short message that reflects the company's branding.

Players can also receive weapons and trinkets from individuals, such as Zer0 and Sir Hammerlock, for completing side missions.