Step 1
Upload Your List
Upload a CSV or Excel file containing email addresses.
Upload your CSV or Excel email list, detect invalid and risky addresses, and download cleaner leads before launching your outreach campaign.
No credit card required · Download results · Built for cold outreach
leads_q2.csv
1,250 emails · Ready to verify
Verify individual addresses or entire CSV/Excel lists with no paywall. Download your results, or use cleaner contacts inside DevBoxy campaigns when you are ready to send.
From upload to export — a simple workflow built for colder, safer outreach.
Upload a CSV or Excel file containing email addresses.
DevBoxy checks syntax, domain records, disposable addresses, mailbox status, risky addresses, and catch-all domains.
Export valid, invalid, risky, disposable, unknown, and catch-all results.
Every address is tagged so you can export only the contacts you want to reach.
Safe to contact — mailbox looks deliverable.
Broken syntax or non-existent mailbox.
May bounce or hurt sender reputation.
Domain accepts all mail — verify carefully.
Temporary inbox — usually skip for outreach.
Could not confirm — review before sending.
Verification is the cheapest way to keep domains healthy and campaigns productive.
Remove known invalid addresses so campaigns land in real inboxes.
Cleaner lists help your messages reach prospects more consistently.
Avoid reputation damage from blasting risky or dead addresses.
Filter temporary inboxes that waste sends and distort results.
Spot contacts that need caution before you spend campaign quota.
Use outreach capacity on emails that are worth contacting.
Upload your list, remove bad addresses, and download cleaner results for free.
Import verified contacts into a campaign, personalize your outreach, manage follow-ups, and track campaign activity from one platform.