How Do Non-Existent Addresses Affect Email Deliverability?
Sending emails to non-existent addresses can lead to a high bounce rate. A high bounce rate can damage your sender reputation, making it more likely for your emails to be marked as spam. Email service providers (ESPs) use bounce rates as an indicator of list quality, so consistently sending to invalid addresses can result in [deliverability](href="") issues, including blacklisting.