I am trying to send an email to about 30 people, but because some of the email addresses seem to be incorrect, I can't send it to anyone. How do I know which email addresses are wrong?
Unfortunately, there really isn't an easy way. If you are getting a bounce-back, it may or may not tell you which email is giving you issues.
Try 10 or 15 at a time to narrow which one it is,
Then go down to 5, and then individually.
Or just one at a time from the start, but it may be time consuming to do it that way.
Retrieving data ...