Every record is reviewed by our human research team, corroborated against independent sources, re-verified in real time before delivery and revalidated every 45 days. Delivered lists carry a 98% deliverability guarantee.
Accuracy & deliverability benchmarks
Each benchmark is measured across the full published dataset at the close of the latest audit cycle, and restated after the next audit.
Emails in a delivered list that do not hard-bounce. If more than 2% hard-bounce, we replace or credit them.
How it's checked: syntax, domain and MX checks, then an SMTP handshake that tests the mailbox without sending, repeated just before delivery.
Contact fields are correct for that person and company today. Non-deliverable, role and catch-all addresses are flagged and excluded.
How it's checked: multi-stage automated verification plus analyst review at every refresh.
Phone numbers that reach the person directly, not a company switchboard.
How it's checked: phone-intelligence checks that tell direct lines from switchboards; analysts tele-verify sampled records.
Keeping data current
So no record stays on file unchecked. This is what happens to every record, every cycle.
Records that cannot be corroborated by an independent source are quarantined and excluded from every published figure.
Verification
People first, software second. Researchers decide whether a contact is relevant; automation then checks it at scale. Compliance review is the final gate.
Where the data comes from
Around each event
Deliverability guarantee
If more than 2% of the emails in your list hard-bounce, we replace them free or credit your account.
Why it matters
B2B outreach is sent from company mailboxes to company domains, and Microsoft 365 limits every sending account.
10,000
recipients a day per Microsoft 365 mailbox
30 / min
messages per account before throttling
Microsoft blocks accounts that send spam past its limits, and business domains apply their own filters: Gmail's consumer rules don't cover Google Workspace inboxes. Every send to a dead address wastes quota and puts your own mailbox at risk.
Sources: Microsoft Exchange Online limits · Microsoft outbound spam protection · Google sender guidelines FAQ
Compliance & security
Business contact information only, processed under legitimate interest for GDPR. Opt-outs are screened weekly and actioned within 30 days.
ISO/IEC 27001:2022
SOC 2VisitorsList is powered by Spokesly Inc. Certificates, controls and sub-processors are published in the Spokesly Trust Center.
Contact data is accurate to a 95% benchmark and direct dials to 85%, measured across the full dataset at each audit cycle. Email deliverability is guaranteed at 98%.
If more than 2% of delivered emails hard-bounce, send your bounce report within 30 days. We replace those contacts within 5 business days or credit your account.
The full database is revalidated every 45 days, job changes are monitored continuously and suppression lists are re-screened weekly.
Both, in that order. Our research team checks relevance first; automated checks then test emails, phones and duplicates, and analysts review samples.
Uncorroborated records are quarantined and never published. A record that fails is re-tested at the next refresh and retired after three consecutive failed cycles.
Request a free sample for any event and check every field before you order.