There are several ways you can end up on an email blacklist:
1. Sending Spam Emails: If your emails are reported as spam by recipients, your IP or domain could be flagged. 2. High Bounce Rates: Sending emails to outdated or incorrect addresses can lead to high bounce rates, which may result in blacklisting. 3. Spam Traps: These are email addresses set up specifically to catch spammers. If you send emails to these addresses, you could be blacklisted. 4. Poor List Management: Buying email lists or not maintaining good list hygiene can lead to sending emails to uninterested or unengaged recipients, increasing the risk of being blacklisted.