Works with MailerLite

Spam Score Checker for MailerLite: Free Browser-Based Tool

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

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

→ Open the free Spam Score Checker

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

Built by the MiN8T Engineering Team · Updated 28 May 2026

MiN8T Spam Score Checker interface preview

MailerLite'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 MailerLite

MailerLite includes a basic spam-trigger checker on paid plans only. Free tier has no pre-send scoring.

Step-by-step: spam-trigger analysis for MailerLite

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 MailerLite

MailerLite-specific deliverability quirks to know

MailerLite's free plan supports up to 12,000 emails/month with HTML campaigns. Their drag-drop editor enforces 600px max width by default.

Frequently asked questions

Does MailerLite include a built-in spam score checker?

MailerLite provides basic functionality but lacks granular control. MailerLite includes a basic spam-trigger checker on paid plans only. Free tier has no pre-send scoring.

Is there a free way to spam-trigger analysis for MailerLite 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 MailerLite.

What image size limit does MailerLite enforce?

MailerLite accepts uploads up to 2000 KB per image and recommends a max width of 600px for email body width. Supported formats: JPG, PNG, GIF, WebP.

Does MailerLite verify SPF, DKIM, and DMARC automatically?

MailerLite requires SPF + DKIM authentication. DMARC policy is your responsibility; their docs reference policy=none as the default.

What about subject line analysis for MailerLite?

MailerLite's subject line tester is preview-only; no quantitative spam-trigger or sentiment scoring. Use the free subject line analyzer for length scoring, spam-trigger detection, and sentiment analysis before pasting into MailerLite.

Related free tools

While preparing your MailerLite 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