Failing to validate new subscribers can lead to several issues:
High Bounce Rates: Invalid emails result in hard bounces, negatively impacting your sender reputation. Poor Engagement: A list with many invalid addresses will have lower engagement metrics like open and click-through rates. Blacklistings: High bounce rates and complaints can lead to blacklisting by ISPs, affecting your ability to reach your audience. Increased Costs: Paying for invalid subscribers increases your marketing costs without any return on investment.