Increased Bounce Rates: Invalid or non-existent email addresses or phone numbers cause bounce backs, which email servers and telecom providers penalize.
Reduced Engagement: Incorrect contact info leads to fewer opens, clicks, and responses.
Wasted Resources: Sending messages to invalid contacts wastes money and time.
Damage to Sender Reputation: High bounce rates and spam complaints can get your brazil mobile phone number list campaigns blacklisted.
How to Avoid This Mistake:
Regularly use email and phone verification tools to validate contacts before adding them to your list.
Implement real-time validation when collecting contacts through forms to reduce invalid entries.
Periodically clean your database by removing bounced, unsubscribed, or inactive contacts.