Works with HubSpot
Spam Score Checker for HubSpot: Free Online Tool
→ Open the free Spam Score CheckerNo signup. 5 free checks a day. Works with any HubSpot campaign.
HubSpot's built-in tools cover the basics, but the spam score checker workflow often benefits from a dedicated check before sending. 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 HubSpot
HubSpot's pre-send 'Spam content' check is rule-based and limited to subject + body word patterns. External multi-rule scoring catches what HubSpot misses.
Step-by-step: spam-trigger analysis for HubSpot
- Paste your campaign HTML into the free SpamCipher spam score checker
- 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 HubSpot
HubSpot-specific deliverability quirks to know
HubSpot's design manager warns at >2 MB total email weight but does not auto-compress. Marketing Hub Professional includes A/B testing; Free/Starter do not.
Frequently asked questions
Does HubSpot include a built-in spam score checker?
HubSpot provides basic functionality but lacks granular control. HubSpot's pre-send 'Spam content' check is rule-based and limited to subject + body word patterns. External multi-rule scoring catches what HubSpot misses.
Is there a free way to spam-trigger analysis for HubSpot campaigns?
Yes. The free SpamCipher Spam Score Checker scores the HTML you paste against 60+ spam rules and an AI classifier, with no signup and 5 free checks a day. Fix what it flags, then send the campaign from HubSpot.
What image size limit does HubSpot enforce?
HubSpot 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 HubSpot verify SPF, DKIM, and DMARC automatically?
HubSpot's connected domains feature handles SPF and DKIM. DMARC must be configured at your DNS provider; HubSpot only verifies it on send.
What about subject line analysis for HubSpot?
HubSpot's content assistant rewrites subject lines via AI but does not provide a quantified spam-trigger score or sentiment analysis. Use the free subject line analyzer for length scoring, spam-trigger detection, and sentiment analysis before pasting into HubSpot.
Related free tools
While preparing your HubSpot 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
Spam Score Checker also works with
