Will your newsletter land in spam?
Paste subject line and HTML and see in seconds which words, links and elements make spam filters suspicious. With a spam score and concrete tips on what to change.
Spam score
Enter a subject line or paste your newsletter’s HTML. The score appears as you type.
Runs in your browser. No sign-up, we store nothing.
How it works
Paste, read, fix.
- 01
Enter subject and sender
As they appear in the inbox. The preheader counts too, if you set one.
- 02
Paste the HTML
The export from your email tool or the source of a test email. Plain text works too.
- 03
Work through the list
Findings are sorted by weight, each with one sentence on what to change. The score updates as you type.
Frequently asked questions
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Emojis sorted by occasion, from sale to Mother’s Day. One click copies, the preview shows how it looks in the inbox.
Email HTML Preview
Paste HTML and see how the newsletter looks on desktop, phone and in dark mode. With a check for common mistakes.
And what are your competitors sending?
Reyo reads your competitors’ newsletters, push notifications, Meta ads and websites and tells you what to do about them.