This is a sample message you could use for a bouncing member:
Your email address has been rejecting our messages. That means we have had more than 50 "soft" bounces from it (which means some kind of failure), or more than 3 "hard" bounces (maybe the address is invalid).
Please check the address you have in Freegle settings at https://www.ilovefreegle.org/settings - you will be able to SAVE to reset if it is correct, or amend if not.
This will enable you to receive messages sent through our system.
Link: Sample Messages