- You'll violate the rules of consent under the CAN-SPAM Act in the U.S. or Canada’s Anti-Spam Law and General Data Protection Regulation (GDPR). Sending to random people who haven’t given you permission to email them is against the law.
- Reputable ESPs don't let you send emails to lists you've bought. Why? One customer's ill-gotten email address list can poison the deliverability of the other customers on that shared IP address. Your account might be terminated or legal action might be taken.
Remember - obtaining permission is fundamental to email marketing success. Do not risk spam complaints by sending customers emails they didn’t ask for.