Upload a CSV and get real SMTP checks, MX/DNS validation, and role/disposable detection back in minutes — plus a proprietary fallback for Google, Microsoft, Yahoo, and ProtonMail catch‑all domains.
> bulk-verify upload --file leads.csv
→ Parsing 12,480 emails…
→ Deduplicating… 11,902 unique
→ Running SMTP + MX/DNS checks…
→ Catch‑all fallback: Google, Microsoft, Yahoo, ProtonMail
→ 9,845 deliverable · 1,204 risky · 853 invalid
✓ Export ready — clean list: 9,845 emails
Trusted by 2,000+ teams and AI builders
98.7%
Verification accuracy
200M+
Emails verified
0.1%
Avg. bounce after verify
50
Free credits / mo
Mailbox‑level checks, not just syntax — built to keep bounce rates low at scale.
Drop in a list of any size. AskOptimus auto‑detects the email column and starts verifying immediately.
Live mailbox‑level verification, not a syntax guess — confirms the address can actually receive mail.
Every domain is checked for valid mail exchange records before an address is marked deliverable.
Flags info@, admin@, and temporary inbox addresses so they don't count against deliverability.
Proprietary scoring for Google, Microsoft, Yahoo, and ProtonMail accept‑all domains — where most verifiers give up.
Download a deliverable‑only CSV, or push verified contacts straight into a sequence.
No mailbox connection required. Upload a CSV, watch results populate in real time, and export only the addresses worth sending to.
john@acme.com
Valid · 99%sarah@bigco.com
Risky · catch‑allinfo@oldcompany.io
Role accountmarcus@startup.dev
InvalidVerify from a CSV, your CRM, or programmatically through the API. Or hand the job to an agent entirely.
“We ran a 40,000‑row list through AskOptimus before our last campaign. Bounce rate came in under 0.3%, and we caught a batch of role accounts we would have wasted sends on.”
— Alex Rivera, Head of Sales at GrowthLabs
The same credit pool covers verification, find, sequences, and AI.
Save 30% with annual billing · Invalid emails are never charged
A bulk email verifier checks an entire list of email addresses at once — confirming syntax, domain, and mailbox‑level deliverability — so you can remove invalid and risky addresses before sending a campaign.
Verification runs at 98.7% accuracy using live SMTP checks, MX/DNS validation, and role/disposable detection, combined with a proprietary fallback for catch‑all domains.
Catch‑all domains accept mail to any address, so a standard SMTP check can't confirm deliverability. AskOptimus applies a proprietary fallback for Google, Microsoft, Yahoo, and ProtonMail to score these addresses instead of marking them unknown.
Yes. Bulk verification only requires uploading a CSV file — no sender account or mailbox connection is needed to run a verification job.
No. AskOptimus only charges a credit for emails that return a deliverable or risky result. Invalid and undeliverable addresses are not charged.
No credit card. 50 free credits forever.
Free forever · Cancel anytime · SOC 2 in progress · 7,000+ AI agents already connected