_:n10fe094cad8f437a843e71a7bcf37257xb0
<http://schema.org/description>
"There are many blacklists, but not all of them are useful or will apply to the messages you send. It&#039;s important to understand how blacklists work, but it&#039;s just as important to know how they don&#039;t."
<https://postmarkapp.com/blog/how-blacklists-dont-work>