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Free tool
Mail Grader - Free Email Campaign Audit and Score
Score any email across deliverability, subject line, copy, and design. Get a prioritized list of fixes that lift opens and clicks.
Free, no credit card. We'll email you only when this tool is live.
What you'll get
- Scores email campaigns across four pillars: deliverability, subject line, copy, and design.
- Audits SPF, DKIM, DMARC, blacklists, and domain reputation in real time.
- Predicts open and click rates based on subject line, preview, and copy patterns.
- Flags spammy phrases, link-to-text ratio, image-to-text ratio, and accessibility issues.
- Returns a prioritized fix list aimed at lifting deliverability and engagement.
How it works
- Paste the HTML or upload the .eml file of the email you want to audit.
- We run deliverability, content, and design checks in parallel.
- You get a 0-100 score per pillar, an overall grade, and a fix list ordered by impact.
Why use a mail grader - free email campaign audit and score?
Most email programs leak performance in places teams cannot see without a structured audit. Deliverability erodes quietly when SPF or DKIM drift; engagement falls when subject lines or preview text underperform; design drags when images dominate the body or alt text is missing. None of these issues throw an obvious error - they just push your open rate down a few points each, and over a quarter that adds up to a materially smaller list and a materially smaller pipeline. A campaign-level grader is the right diagnostic for catching all of them at once.
The value is in the prioritization. A senior email marketer would catch most of these issues in a fifteen-minute manual review, but most teams do not have a senior email marketer on staff. The grader compresses that review into seconds and orders the fixes by likely impact. Run it on every campaign before send, on the previous quarter's lowest-performing sends to figure out what went wrong, and on competitor sends you have admired to learn what they got right. For email-driven businesses, this is one of the highest-leverage free tools in the stack - a few percentage points of open-rate lift across a year compounds into meaningful pipeline. Pair it with consistent A/B testing on subject lines and previews and the program improves measurably within a quarter.
Best practices
- Run the audit on every campaign before sending - deliverability issues are cheap to fix at draft stage.
- Audit your worst three campaigns of the last quarter to find systemic patterns.
- Aim for a 70/30 text-to-image ratio in the body for accessibility and deliverability.
- Watch the spam-phrase flags closely - they are the lowest-effort fix with measurable impact.
- Pair the grader with subject-line A/B testing for compounded gains.
FAQ
Is the Mail Grader free?
Yes. Free tier covers individual campaign audits. Paid plans add bulk audits, team workspace, and trend tracking.
What does the score measure?
Four pillars: deliverability (SPF, DKIM, DMARC, reputation), subject line, body copy, and design.
Will it actually send the email?
No. The audit analyzes the message in place; nothing is sent.
What input does it accept?
HTML pasted directly or an uploaded .eml file. We extract subject, preview, and body for analysis.
Can I audit transactional emails?
Yes - the deliverability and design checks apply equally to transactional, lifecycle, and broadcast emails.
Does it predict open rates?
We provide a directional prediction based on subject line and preview patterns, not a guarantee.
Is my email content stored?
No. Audits are processed in memory and the content is discarded immediately after the report is returned.
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