Sending thousands of emails that: Bounce because they aren't real. Land in inboxes of people who don't remember your service and therefore mark it as spam.

Sending thousands of emails that: Bounce because they aren't real. Land in inboxes of people who don't remember your service and therefore mark it as spam. Land in inboxes and are not opened. Are all great ways to get IP banned from email providers, banned by your email sending application because you got their send IPs blacklisted or kicked out of Gmail/Outlook cloud/.me account.