Confirmed opt-in or opt-out?

There are various methods used to build mailing lists & contact databases. Choose wisely – the quality of your contacts directly affects deliverability.

*** This is a Security Bloggers Network syndicated blog from The Spamhaus Project authored by The Spamhaus Team. Read the original post at: https://www.spamhaus.org/resource-hub/deliverability/confirmed-opt-in-or-opt-out