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Email spam checklist before you send
Use this email spam checklist to review subject lines, copy, links, HTML, authentication, and unsubscribe handling before an outreach send.
By OmniReach··3 min read
There is no single score that can guarantee an email will avoid spam folders. Recipient systems weigh sender reputation, authentication, message content, engagement, and their own filtering rules. You can still catch many avoidable problems before sending by reviewing the message and its setup systematically.
Use the free email spam checker to scan a draft's subject, body, and optional HTML for common content-risk signals. It is a transparent preflight, not an official Gmail or Outlook score.
Quick answer
Before sending, check that the message has a specific subject line, clear and truthful copy, expected links, readable HTML, a working opt-out process where required, and passing SPF, DKIM, and DMARC for the sending domain. Then send a test and inspect the real message headers.
Check the subject and body
Read the message as the recipient would:
- Is the subject specific and consistent with the body?
- Does the first sentence explain why you chose this person?
- Are claims accurate and supportable?
- Is the call to action small and clear?
- Does the message avoid excessive punctuation, capitalization, urgency, or repetitive sales language?
These are not universal spam rules. They are practical checks that help you avoid writing something that looks automated or misleading.
Review every link
Use only links you expect the recipient to see. Make sure each URL goes to the stated destination and that the visible text does not disguise a different domain. Avoid adding several unrelated links to a short cold email.
If a tracking or redirect link is required by your provider, send a test and confirm it works as intended. Broken redirects and unexpected domains create a poor recipient experience even when the message technically delivers.
Keep HTML simple
If you send HTML email, check it alongside the plain-text version. Avoid hidden text, text made to look invisible, or an image-only message with no meaningful fallback copy. Verify that the email remains readable when images do not load.
The spam checker can flag some of these content patterns, but it cannot predict a recipient's filter.
Verify authentication before scaling
Content is only one layer. Before increasing volume, confirm that the sending domain is configured for SPF, DKIM, and DMARC:
- Run an SPF lookup for the domain or bounce domain your provider uses.
- Confirm that your email provider is signing with DKIM.
- Publish and monitor a DMARC record.
- Send a test message to a mailbox you control.
- Review the raw headers for the receiving server's authentication results.
Respect recipient choice
Make it straightforward for a recipient to decline future messages, and make sure your process honors that request. Local laws and business requirements vary, so do not treat a generic checklist as legal advice.
Frequently asked questions
Is there a guaranteed spam score?
No. Providers use private and changing signals, including sender reputation and recipient behavior. A content preflight can find common risks but cannot guarantee placement.
Should I remove every word a checker flags?
No. Review the context. Rewrite only when the message is unclear, misleading, overly promotional, or otherwise a poor fit for the recipient.
Why does a clean message still go to spam?
Authentication, sending reputation, list quality, recipient engagement, and the recipient's own filtering policy all affect placement.
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