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.