A: Thanks for the query. We use multiple methods to verify an email address. However, we do not send any real email from any of the addresses. We can understand that sending a real email from a different domain will definitely preserve the reputation of our main domain. However, that email will be a spam/annoying email for that user and we never want to spam/disturb the users of the emails that our users are verifying. However, without sending a real email (we do follow the SMTP process and close it just before the end), our system can identify valid and invalid emails. Let us know if you have any questions.