The Email Template Checker That Tests Where Sends Actually Fail.

A complete template check covers two layers. The message layer: spam trigger words, broken links, malformed HTML, image-heavy layouts, and a missing plain-text part. The recipient layer: whether each address on the send list is real and live. The tool on this page covers the recipient layer with 9 checks per address; the pre-send checklist above walks the message layer, with the spam content checker handling your copy.

Run four passes. Scan the copy for trigger phrases with the spam check. Click-test every URL with the email link checker. Send the template to your own Gmail and Outlook inboxes to confirm it renders. Then verify the recipient list here, because a clean template mailed to dead addresses still bounces. The whole loop takes minutes.

Filters score patterns, not single words, but the classic offenders are pushy money and urgency phrases: act now, limited time, 100% free, risk-free, no obligation, plus all-caps subject lines and stacked exclamation marks. One trigger rarely sinks a send. Several together, inside a heavy HTML template aimed at a stale list, usually do. The spam content checker scores your copy line by line.

Yes. Mail clients and filters penalize broken markup, image-only messages with thin text, and oversized payloads. Gmail clips messages above roughly 102 KB, hiding whatever sits below the fold, unsubscribe link included. Keep templates lean, balance images with real text, ship a plain-text part, and pair the HTML work with an address-level deliverability test on the list itself.

Because 20 to 40% of B2B email lists fail at catch-all domains, the check most free tools skip. Every hard bounce tells mailbox providers your hygiene is poor, and that reputation damage follows every future send regardless of template quality. The email verification engine resolves catch-alls with an AI-confidence pass, so you only mail addresses that can actually receive the template.

Yes. The pre-send checklist is free to use forever, and you can verify 4 recipient addresses a day on this page with no account. Create a free account for 1,000 verifications, or 2,500 if you sign up with a work address. No card required, and paid credits never expire, with volume pricing shown for your region.

99.99% on a 1,000-address benchmark list, catch-all domains included. The free check runs the identical 9-point engine as the paid API: syntax, domain and MX, SMTP handshake and mailbox ping, disposable and role detection, catch-all resolution with AI-confidence scoring, domain age, and SPF, DKIM, and DMARC authentication. The same engine powers the free email checker. The free tier caps volume, never accuracy.

Yes. Upload a CSV or call the API and bulk verification runs at roughly 10,000 emails per minute on the standard tier. Median single-address latency is about 380ms, sub-50ms when cached, so most pre-campaign list cleans finish before the template clears design review. The free email validator handles bulk uploads on the same engine.

No. Addresses are processed in memory and discarded the moment verification completes. Nothing stored, nothing logged, nothing sold. Verifox is SOC 2 Type II compliant, and the privacy policy spells out exactly what we touch and what we never keep. Your send list stays yours.

Yes. The REST API reference documents request and response shapes for every endpoint, so your campaign tool can verify recipients before each send. HubSpot, Salesforce, Zapier, Klaviyo, Mailchimp, and Brevo connect out of the box, and the native MCP server lets AI agents like Claude or Cursor run the check without glue code.