AnalyticsPublished30.04.2026

Donor Spam Score (Spamnost donora)

How to assess a site's spamminess from outbound SEO links. Metrics like CheckTrust, Spam Score, and how to avoid link-farm backlinks.

On this page
What is donor spam scoreSpam evaluation metricsUsing it in link building
In brief

Donor spam score is a metric indicating how actively a site sells or places unnatural external links. High spamminess reduces link value and increases the risk of search engine filters.

What is donor spam score

Donor spam score (or Spam Score) evaluates how much a site's backlink profile resembles a typical link farm. If a site sells links to casinos, pharma, essays, and other shady topics, it becomes a source of toxic weight.

Spam evaluation metrics

  • Spam Score (Moz) — percentage probability of a penalty.
  • CheckTrust (Majestic) — site trust assessment.
  • Citation Flow / Trust Flow ratio — citation-to-trust ratio.
  • Outbound link analysis: quantity, topic, anchors.

Using it in link building

Before acquiring a link, evaluate the donor. A high Spam Score (over 60–70%) makes placement risky. The ideal donor is a topically relevant site with low spam score and natural outbound links.

Even a few links from high-spam sites can trigger an algorithmic filter. Clean your backlink profile regularly.
FAQ

Common questions

A Moz metric predicting the likelihood of a Google penalty based on correlations with hundreds of spam factors.
Aim for zero. Up to 30% may be tolerable in low-competition niches, but higher is risky.
High Trust Flow doesn't cancel link toxicity, but it can soften the overall picture. Remove clearly harmful links.
MozBar shows Spam Score, Majestic offers free access to Trust Flow and Citation Flow.
Direct contacts

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Donor Spam Score (Spamnost donora) — What is it?