Email Spam Tester

Send the exact message you're about to send your list to a disposable test address, and get back a full deliverability report in minutes. No signup, no credit card, no install — just send an email the way you already do.

The tool runs 42 separate checks across authentication (SPF, DKIM, DMARC), infrastructure reputation, content filters, link reputation, and Gmail/Yahoo bulk sender compliance rules. Two independent spam engines score your content, so you're not relying on a single filter's opinion.

You get two scores: a classic SpamAssassin-compatible number (lower is better, threshold is 5) and a proprietary 0–100 score that also covers the bulk sender rules Gmail and Yahoo began enforcing in 2024. Both scores reflect the same message, so you can compare against results from other tools.

Every warning in the report cites the specific RFC section or Google policy page it comes from. You can verify every finding yourself — nothing is a black box.

The fix plan doesn't estimate improvements — it rescores the corrected version of your message to show exactly how many points each change is worth. Work through fixes in order of impact, then retest.

The tool also checks your sending IP and domain against more than 20 blocklists. If reputation is the problem, the report names the specific blocklist so you know exactly where to start.

The disposable test address accepts one message and expires after an hour. The report link doesn't expire, so you can share it with whoever manages your DNS. First 100,000 reports are free with no per-person cap, and 5 tests per IP per day remain free permanently after that.