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Deliverability tools

Free and no signup. The same engines as the YourTrend dashboard, plus an open API you can call from your own scripts.

Email validatorSpam testBlocklistsSMTP diagnostics

Check whether an address exists and can receive mail — without sending anything.

The validator parses the address syntax, checks the domain’s MX records (whether it accepts mail at all), flags disposable (temp-mail) and role addresses (info@, admin@, support@), and returns a 0–100 deliverability score. Clean your lists before a send so you don’t hit dead mailboxes, pile up bounces or burn your sender reputation.

Via API: POST /api/v1/tools/validate-email {"email":"…"} · Limit 30 requests per minute.

Email validatorLive engine

See your message’s spam score before you send — from the subject and body.

Content checks return a score from 0 to 100: higher is better. Scores of 80 or more are good; 55–79 need work; below 55 indicates high risk. Paste the subject and body or HTML to check wording, text-to-link and image balance, unsubscribe links and empty merge tags. This estimate does not guarantee delivery: authentication and sender reputation also matter.

Via API: POST /api/v1/tools/spam-score {"subject":"…","text":"…"}

Spam testLive engine

Check an IP or domain against the major blocklists (DNSBL).

A single listing on Spamhaus, Barracuda or SpamCop can wreck deliverability — mail goes to spam or bounces outright. This tool queries the major DNSBLs and shows where you’re listed. Check your sending IP and domains regularly, and if you’re listed, fix the cause and request delisting on the list’s own site.

Via API: POST /api/v1/tools/blocklist {"ip":"…"}

BlocklistsLive engine

Live check of a domain’s mail server: MX, connection, STARTTLS, SPF/DMARC.

We look up the domain’s MX records, connect live to the primary server on port 25, read the greeting banner, ask for the ESMTP extension list and check STARTTLS (channel encryption) support. We also check whether SPF and DMARC are published. It’s a fast way to confirm the domain accepts mail, the server is reachable and TLS is configured — no manual telnet needed.

Via API: POST /api/v1/tools/smtp-diagnostics {"domain":"…"}

SMTP diagnosticsLive engine

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