Deliverability
How to check if an e-mail address is valid for free
Free ways to check an e-mail address: syntax, MX lookup with dig or nslookup, disposable and role flags, why SMTP probing backfires, and when to pay.
10 min read
Articles tagged “Email verification”
9 articles.
Developers
How to check if an e-mail address exists without sending an e-mail
What syntax, MX, disposable-domain and mailbox checks can tell you without sending mail, why SMTP probing gives false answers, and tested code in Node, Python and PHP.
11 min read
Guides
Yahoo email checker: how to check if a Yahoo Mail address exists, one at a time or in bulk
To check if a Yahoo email exists, send a test message and read the bounce, or run an account check in bulk. SMTP probes fail at Yahoo; here is why.
15 min read
Guides
How to check if a Gmail, Yahoo or Outlook account exists without sending an e-mail
Check if a Gmail, Yahoo or Outlook account exists without sending mail: why SMTP probes fail at big providers, address aliases, bulk lists and privacy.
9 min read
Guides
Role-based e-mail addresses: accept, flag or block?
What role-based e-mail addresses are, when to accept, flag or ask for a personal address, and how to detect them without false positives.
8 min read
Guides
E-mail verification: the complete 2026 guide
E-mail verification explained step by step: syntax, MX, mailbox, catch-all, disposable and bounce checks, account signals, privacy rules, and which check fits which job.
10 min read
Guides
E-mail verification vs account existence checks: what's the difference?
Mailbox validation says an address can receive mail. An account check says it is registered on a service. When to use each, and the privacy rules.
8 min read
Fraud prevention
How to reduce fake sign-ups with layered phone and e-mail checks
A layered sign-up defence: format, line type, messaging presence, spam reputation and e-mail checks, mapped to friction tiers you can measure.
8 min read
Guides
A privacy checklist for phone and e-mail checks
A practical GDPR-oriented checklist for phone and e-mail checks: purpose, lawful basis, minimisation, retention, objections, rights, DPAs and logging.
9 min read
