B Evidence Grade B Graded accuracy verified by the review judge Safe to Cite Current

3 -- spam score threshold for Outbound marketing emails scanned by spam testing tools (2026)

Name: Spam Score Threshold Statistics
Creator: Lighthouse Intelligence
Published: 2026-09-07

2026 · Aurora SendCloud

If the spam test score of an email exceeds 3.0, warning items must be corrected prior to sending.

Guideline threshold for pre-send testing, not an empirical statistical measurement across a specific campaign

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Attribution: Aurora SendCloud View source

Lighthouse Research Team

Last verified: 2026-09-07 · How we verify data →

Source verified Evidence graded

Value

Unit

Score

Data Vintage

2026

Entity

Outbound marketing emails scanned by spam testing tools

Evidence Quality

Strong, reliable evidence

Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.

61/100 confidence

Single source - not yet corroborated

Score breakdown

Extraction

Source Trust

Citation Chain

Independence

Methodology

Freshness

Source

Aurora SendCloud Primary Tier A

https://www.aurorasendcloud.com/zh-tw/blog/email-spam-filters ↗

Confidence: 57/100 Vintage: 2026 Channel: Common Crawl

Source Article

垃圾信過濾器運作完整指南

Original Research

Aurora SendCloud · Original study ↗

Methodology

Deliverability guidance threshold: if spam test score exceeds 3.0, fix warning items before sending; no specific study period stated, collection year used as vintage

Methodology documented

Segmentation

Industrymarketing

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Plain Text

Outbound marketing emails scanned by spam testing tools: 3 spam score threshold. Source: Aurora SendCloud (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/spam-score-threshold-3-0

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<blockquote cite="https://lighthousedata.io/data/spam-score-threshold-3-0" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>3</strong> -- spam score threshold for Outbound marketing emails scanned by spam testing tools<br><small>Source: Aurora SendCloud (2026) · <a href="https://lighthousedata.io/data/spam-score-threshold-3-0" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>

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