Stop Bounces Before They Kill Your Campaigns

Cold email outreach lives or dies on list quality. One dirty list can tank your sender reputation, get your domain blacklisted, and destroy campaigns that took weeks to build. Verify every address before you send.

Start Free — 100 Credits See Bulk Verification →

Everything You Need for Clean Cold Email Lists

Multiple layers of verification catch invalid, risky, and low-quality addresses before they damage your sending reputation.

SMTP Verification

Goes beyond MX record checks. VeriMails performs live SMTP handshakes to confirm each mailbox exists and accepts mail before you hit send.

Catch-all Probability Scoring

Corporate mail servers that accept all addresses are everywhere in B2B. VeriMails scores each catch-all 0–100 so you know exactly which ones to send to and which to skip.

Disposable Email Detection

Block temporary addresses from Mailinator, Guerrilla Mail, and hundreds of other throwaway providers. Focus outreach only on real, permanent business addresses.

Role Address Filtering

Automatically flag info@, admin@, support@, sales@ and other role-based addresses that go to teams instead of individuals — reducing spam complaints.

Bulk CSV Processing

Upload your entire prospecting list and get back a verified CSV with status, score, and catch-all flags for every address. Handles thousands of addresses efficiently.

Real-time API Integration

Verify leads the moment they enter your pipeline. Call the API from your scraper, CRM import, or outreach tool — invalid addresses never make it to your sending queue.

From Dirty List to Clean Campaign in 3 Steps

A straightforward workflow that fits into how you already source and manage prospects.

Export and upload your list

Export your prospect list as CSV from LinkedIn Sales Navigator, Apollo, or wherever you source leads. Upload it directly to VeriMails for bulk processing.

Review verification results

Download your verified list with status codes, catch-all scores, and confidence levels for every address. Filter out invalid, disposable, and low-confidence results.

Send with confidence

Import your clean list to your sending tool. With bounces eliminated and catch-alls scored, your campaigns land in inboxes instead of blacklists.

Frequently Asked Questions

Re-verify any list older than 30 days before sending. Email addresses decay at 2–3% per month. For high-volume campaigns or actively rotated lists, verify weekly.

Keep bounce rate below 2%, ideally under 1%. With SMTP verification and catch-all scoring, most VeriMails users achieve 0.5–1.5% bounce rates on verified lists.

Yes — selectively. Addresses scoring 80+ on catch-all domains are very likely valid. Skip anything below 30. This approach lets you reach valid contacts without risking bounces from unresolved addresses.

No. Bulk verification runs offline — you upload a CSV, we process it, you download the results and import your clean list. For real-time use, the API responds in under 2 seconds.