Works with Campaign Monitor

Spam Score Checker for Campaign Monitor: Free Browser-Based Tool

Q: Is there a free way to spam-trigger analysis for Campaign Monitor campaigns?

Yes. The MiN8T Spam Score Checker below runs entirely in your browser — no signup, no upload, and the output works with any Campaign Monitor workflow.

→ Open the free Spam Score Checker

Browser-only, no signup, no upload. Output works with any Campaign Monitor campaign.

Built by the MiN8T Engineering Team · Updated 28 May 2026

MiN8T Spam Score Checker interface preview

Campaign Monitor's built-in tools cover the basics, but the spam score checker workflow often benefits from a dedicated, browser-only preprocessor before uploading. Pre-send spam-trigger analysis catches issues before they impact your sender reputation. Free rule-based scoring combined with a Naive Bayes classifier identifies precisely which content triggers fire.

Why pre-process before uploading to Campaign Monitor

Campaign Monitor's deliverability dashboard is post-send. External pre-send scoring catches issues before they hit subscriber inboxes.

Step-by-step: spam-trigger analysis for Campaign Monitor

Paste your campaign HTML into the free spam score checker below
60+ rules evaluate subject patterns, body keywords, header completeness, link density, HTML structure, image-to-text ratio, and authentication signals
A Naive Bayes classifier trained on 50,000+ labeled messages provides a complementary spam-probability score
Review the rule-by-rule breakdown and fix triggers before sending via Campaign Monitor

Campaign Monitor-specific deliverability quirks to know

Campaign Monitor's design language emphasizes typography over imagery. Pre-compressed images preserve their brand-forward aesthetic.

Frequently asked questions

Does Campaign Monitor include a built-in spam score checker?

Campaign Monitor provides basic functionality but lacks granular control. Campaign Monitor's deliverability dashboard is post-send. External pre-send scoring catches issues before they hit subscriber inboxes.

Is there a free way to spam-trigger analysis for Campaign Monitor campaigns?

Yes. The free MiN8T Spam Score Checker runs entirely in your browser — no signup, no upload, no rate limits. The output is a standard file you can upload directly to Campaign Monitor.

What image size limit does Campaign Monitor enforce?

Campaign Monitor accepts uploads up to 1000 KB per image and recommends a max width of 600px for email body width. Supported formats: JPG, PNG, GIF.

Does Campaign Monitor verify SPF, DKIM, and DMARC automatically?

Campaign Monitor offers SPF and DKIM with custom sending domain. DMARC policy is configured at your DNS provider.

What about subject line analysis for Campaign Monitor?

Campaign Monitor offers AI subject line generation but does not quantify spam triggers or sentiment. Use the free subject line analyzer for length scoring, spam-trigger detection, and sentiment analysis before pasting into Campaign Monitor.

Related free tools

While preparing your Campaign Monitor campaign, you may also want:

Image Compressor — also free, browser-based, optimized for email marketers
GIF Compressor — also free, browser-based, optimized for email marketers
CSS Inliner — also free, browser-based, optimized for email marketers
Inbox Preview — also free, browser-based, optimized for email marketers