Advanced Email Verifier vs MillionVerifier

Advanced Email Verifier checks addresses in databases and mailing lists for validity and helps identify bounced or undeliverable contacts. It can verify directly through SMTP; its optional validation API mode requires a separately purchased Swift Email Verifier key. ODBC connections to MS Access, MS SQL, MySQL, and Oracle let users check database addresses without importing and exporting them. The software also imports lists from CSV, Excel, XML, MS Access, and DBISAM, and exports results and custom fields to formats including CSV, HTML, XML, and SQL script. Its bounce handler processes messages from POP3 or IMAP servers, or local and network folders. Other tools check syntax, remove auto-replies, sort and filter addresses, and save or recover data after an interruption. It runs on Windows; Mac use requires Parallels Desktop and a Windows license, and no Linux version is available. Some addresses may remain Unknown, and results depend partly on server setup and IP reputation. The free demo has limited verification capacity; the single-user license is $99 as a one-time purchase.

MillionVerifier checks email addresses individually, in uploaded lists, through an API, or by importing from email-service providers. It accepts CSV, TXT, and XLSX lists and supports bulk verification. Its REST API is described as sub-second for signup-form checks, with global low-latency endpoints. EverClean checks new contacts in connected email-service-provider accounts each day and can remove bad addresses automatically. The service advertises 99%+ accuracy, advanced catch-all checks at no extra cost, and refunds for emails it cannot verify with certainty, including a 100% money-back guarantee for risky emails. It lists more than 40 integrations, including Mailchimp, HubSpot, ActiveCampaign, and SendGrid, and offers custom endpoints for connecting CRMs or databases. MillionVerifier says it is GDPR compliant, does not sell customer data, and permanently deletes uploaded and result files within one month. It is for business, professional, trade, public-sector, or organisational use. The free plan and trial are available; paid bundles start at $39, paid once for 10,000 credits, which do not expire.