Validates and verifies an email address assessing deliverability and quality. There are plenty of significant reasons behind having proper validation in place: 1. Sending emails to fake/no-longer-existent addresses will hurt your deliverability. 2. Mistyping an email address will block users from confirming their account or resetting a password. 3. Valid e-mail addresses, lets you stay in touch with users. 4. Improves ROI of your email marketing campaign 5. Helps in maintaining domain reputation.