Welcome to the Pet Rescue Community
Do you need help with your game? Ask the Community for help.
I thought generally that if you didn't have a mailbox it's because you didn't have mail? That would make sense and would tie in with the information here if the requests aren't getting through:
https://care.king.com/en/papa-pear-saga/i-m-not-receiving-my-messages-lives-from-friends