You are examining the bounce messages you received from your most recent email send, and you’ve found multiple “550” or recipient bounce errors. With this new knowledge, what action should you take to improve your next email send:
A) Make sure there are no spelling or grammatical errors in your email
B) Add a plain-text version of the email to signal that the content is not spam
C) Stop sending to this address
D) Stop using a link shortener
https://www.youtube.com/watch?v=ABM7PIfz96Y