Keeping unsubsribers out in the future

[Robert Fahey]

I send a lot of emails. When people unsubscribe, I must make sure I don't accidentally re-enter them later. How can I prevent accidental re-entry? I'd like to use an input mask or something to prevent entering certain email addresses. Possible?

[pbaldy]

I don't see how an input mask could help. If you leave the unsubscribed email addresses in your table but with a status flag, you can just check for duplicates as you enter. Or you can have a table of "do not use" addresses and check against that during data entry.