Would Google and Yahoo accept this email?
Since 2024 Google and Yahoo reject bulk mail that skips their rules, and Microsoft followed in 2025. Paste the headers of a real message you sent and we grade it with the same rulebook our product runs on live sending streams: authentication alignment, one-click unsubscribe, the DKIM rule that binds them, and the DNS records behind it all.
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Send yourself the campaign (a real send, not a preview), open it, then in Gmail: three-dot menu, “Show original”, copy everything. Headers only, never the body, and we don't store what you paste.
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Monitoring grades every sending stream from real probe messages, joins your Gmail spam rate and Microsoft rejections, and alerts you the day a stream slips. Free for one domain.