There's no clean way to verify an email address. Here's what works anyway.

You have a list of addresses. Maybe they came from a signup form, a partner CRM, an enrichment run, or last quarter's webinar. You want to know which ones are real before you put them on a campaign and torch your sender reputation. You search "email verification" and find a hundred services with landing pages claiming 99% accuracy. You install the obvious package, run it on your list, and 95% come back "valid." You send. A quarter of them bounce, and the major inbox providers start flagging your