How do you verify consent when importing old lists?

Verifying consent when importing old lists requires evaluating the original collection method and documentation. Can you prove how each address was collected? Was the consent specific to your communications or for a different purpose?

If documentation is weak or consent was not explicit, consider re-permission campaigns before bulk importing. Send verification requests asking recipients to confirm they want to receive mail from you.

High risk addresses without clear consent documentation should be excluded or handled separately with careful volume limits and monitoring. Importing poor quality data damages reputation regardless of theoretical consent claims.