Mail7.net

Key features

• Checks the syntax, the domain's mail servers, then the mailbox itself, and answers Valid, Not Valid or Unknown.
• Bulk email checker: Paste a list or drop a CSV, pick the column with the addresses, and watch the verdicts land.
• API access is included on every plan, Free included - confirm your email address and create a key.
• Integrations for WordPress, Zapier, n8n, Make, Google Sheets, MailWizz and a Chrome extension.
• No account needed for single checks. 1,000 verified addresses a month on the free plan.
• Disposable domains are detected and reported as Not Valid.
• Duplicates in a file are never charged: the same address is checked once.
• Domain checker covers MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, DNSSEC and BIMI.

Use cases

• Clean the list before you send. Fewer bounces, a protected sender reputation, and no budget spent mailing addresses that died in 2019.
• Catch typos and disposable domains while the person is still on the form.
• Verify imported leads before your sales team spends a week emailing nobody.
• Call the API from registration, contact forms and data imports, and keep the database clean.
• Check if bulk emails are valid by uploading a file or pasting addresses.
• Check domain setup for MX, SPF, DKIM, DMARC, and more.

Pros

• Unknown results are never counted or billed.
• Single email checks and SPF analysis are free, no account required.
• API access is included on every plan, including Free.
• Duplicates in a file are never charged.
• Transparent reporting: Valid, Not Valid, or Unknown, never a guess.

Limitations

• Some mail servers accept mail for every address (catch-all), delay unknown senders (greylisting), or block verification attempts.
• A real, working address may be marked 'Unknown'. This is a limitation of how those servers are configured, not an error in the check.

Screenshots