Hello @StephenB445 ,
Per our Email Permission Policy you are not allowed to use a purchased list within Constant Contact. However, we have some great guides on growing your contact list organically. If you have any additional questions about that process, please let us know.
I misspoke. It is a customer that is about 20 years old. I owned a mortgage company I owned about 20 years ago and sold it to Quicken loans. We are finding a high percentage of them no longer exist and we are eliminating them and that is why the bounce rate is so high.
We're happy to hear you were able to narrow this down! Deleting old emails and email addresses that are no longer any good is a great step to take. This allows you to keep your contact lists clean improving your email's deliverability and open rates, and reducing spam reports.