Email Address Validator

Email Address Validator takes a list of email addresses (your existing customer database, newsletter signups, contact list) and verifies each one without actually sending mail. Syntactic check, domain MX-record lookup, optional per-mailbox SMTP probe.

What it does

For each address in your list the tool performs up to three increasingly strict checks:

1. Syntax — is user@domain.tld well-formed?
2. MX lookup — does the domain have a mail server configured?
3. Mailbox probe (optional) — can we open an SMTP conversation up to RCPT TO without actually sending? A clean rejection here means the address probably doesn't exist.

What this tool is NOT

This is a validator, not a harvester. It does not scrape websites for new email addresses. It does not send bulk mail. It does not bypass spam filters. Its job is to clean a list you already have before you send legitimate, opt-in mail to it.

Why bother validating?

• Lower hard-bounce rates — mailbox providers penalise senders with high bounces
• Better deliverability — a clean list keeps you out of spam traps
• Smaller send costs — transactional providers charge per attempt, not per delivery
• Cleaner reporting — bounces stop dirtying your open-rate metrics
• Compliance — GDPR and similar regimes require you to keep accurate data

Features

• Bulk validation from CSV or text-file input
• Three-tier check: syntax, MX, mailbox probe
• Per-address result with reason code
• Export filtered "valid only" list
• Multi-threaded validation for large lists
• Portable, no installer

System requirements

• Windows 7, 8, 10, 11
• An internet connection for DNS / SMTP queries
• About 1 MB of disk space