Most link building campaigns fail because teams blast thousands of emails and...

https://station-wiki.win/index.php/Hunter_vs_NeverBounce_vs_ZeroBounce:_Choosing_the_Right_Engine_for_Your_Outreach_OS

Most link building campaigns fail because teams blast thousands of emails and eventually get blacklisted. Instead, prioritize quality over volume. Stick to sending 50-75 emails per day to keep your domain reputation pristine