Email outreach remains one of the most effective sales techniques, but unfortunately, not all emails get successfully delivered. Snov.io users send out millions of cold campaigns every day.
Problem 1: You send emails to invalid email addresses
If you use a single opt-in, your email list might get filled with invalid email addresses, as some new subscribers tend to put in fake emails or make spelling mistakes. Besides, invalid email addresses might populate your database if you follow unhealthy lead generation practices, like buying email lists and not verifying the email addresses you've collected.