Why Verify Email Lists Before Sending?
Mailbox providers junk senders whose bounce rate crosses roughly 2%. One un-verified campaign to an old list can burn a sending domain that took a month to warm up. Running every list through a verifier first — including purchased ones — keeps your deliverability intact and your campaigns in the inbox.
What This Tool Checks
- Syntax — RFC-compliant address format
- Mail server — live MX/A DNS records on the domain (dead domains = guaranteed bounces)
- Disposable domains — temporary inbox services that vanish in minutes
- Role accounts — shared inboxes like info@ and sales@ that convert poorly in cold outreach
Free Tool vs. Campaign-Grade Verification
DNS-level checks catch most dead addresses, but only SMTP-level verification (connecting to the mail server and testing the mailbox) catches full inboxes and disabled accounts. Every database sold on Lead-Mail goes through that deeper pipeline before delivery — it's how we back our 95% deliverability guarantee. Learn what else to look for in our email list buying guide.