Free tool
Email spam checker
Paste your subject line and email body below. This scans for the wording and formatting patterns that most commonly trigger spam filters — the same checks we run before any campaign goes out.
NoteThis runs entirely in your browser — nothing you paste here is sent anywhere or stored.
CaveatIt's a heuristic guide, not a deliverability guarantee. Real spam placement also depends on domain reputation, authentication (SPF/DKIM/DMARC) and sending volume — see our infrastructure approach.
What it checks
Five categories, weighted by how often they matter.
Trigger phrases
Wording that filters and recipients both associate with mass spam — "act now", "100% free", "no obligation", "risk-free", and similar.
Punctuation and formatting
Excess exclamation marks, ALL-CAPS subject lines, and currency symbols stacked together ("$$$") read as low-effort blasts.
Link density
Multiple raw links in a short cold email are one of the strongest spam signals filters use.
Subject line length
Very short or very long subject lines both under-perform and can read as automated.
Personalisation signal
A body with no sign of a specific recipient — no name, no company reference — reads as a mail-merge blast rather than an outbound conversation.
NoteNone of this replaces warmed, authenticated sending infrastructure — see how we protect domain reputation.
Next
Wording is one variable. Infrastructure is the other.
If your emails are clean but still landing in spam, the problem is usually the sending domain, not the copy. Let's talk about it.