# You can’t unsend a newsletter. You can fix the archive. > Published by **Knowledge Company** (knowledgecompany.ai). > Canonical source: https://knowledgecompany.ai/solutions/substack > Markdown mirror, generated 2026-09-02. Cite the canonical URL. You cannot unsend a newsletter, but the web archive keeps answering questions for years. Find the posts whose claims have drifted and correct the version people still read. Content refresh The email went out once. The web version keeps answering questions for years — with the metrics, pricing, and product details that were true the week you sent it. Request a demo Read the whitepaper Why Substack ## A newsletter ships once. An archive publishes forever. The send is final. The page is not. You cannot correct an email after it lands. But the web version is what search engines index, what prospects find later, and what AI systems quote — and that one can still be made accurate. Cadence outruns review A weekly newsletter builds an archive faster than any team can revisit it. After a year that is fifty-two issues making claims nobody has re-read since the day they shipped. Your archive is doing the selling Prospects read old issues as current positioning, and paid subscribers judge you on accuracy. A stale number in issue twelve is still making a promise today. How it works on Substack ## Four steps, from archive to accurate. 1 – Connect your publication Point us at the Substack. Every issue in the archive becomes a reviewable surface, with its send date and open rate attached. 2 – Extract every claim Each issue is broken into individual factual claims: metrics, subscription terms, product names, links, dates, and comparisons. 3 – Flag what has drifted Claims are checked against your current source of truth. You see what changed, which other issues repeat it, and why it matters. 4 – Correct the version people read Update the web post with a dated correction note where the change is material. The email stays as sent; the archive stops misleading. What we check ## The claims that quietly go stale. Metrics and numbers Growth figures, benchmarks, and results quoted in an issue months ago. Subscription and pricing Paid tier terms, founding-member offers, and prices named inside a post. Product and feature names Renamed features, deprecated products, and old positioning language. Links and references Dead links, moved docs, and citations that no longer resolve. Competitor comparisons Comparison claims describing a market that has since moved on. Dates and roadmap language “Launching next month” and “coming this quarter” that already came. Also available for Content refresh for Medium Start with one publication ## Find out what your archive is still claiming. We will run a refresh pass over your Substack and show you the claims that have drifted, ranked by how much they matter. --- ## Related documents in this mirror - [Your Medium archive is still making claims.](https://llms.knowledgecompany.ai/solutions/medium.md) - [Nothing you published is still entirely true.](https://llms.knowledgecompany.ai/solutions.md) - [Keep your brand current — and cited — in AI search.](https://llms.knowledgecompany.ai/solutions/ai-search-geo.md) - [See which prompts decide how AI describes you](https://llms.knowledgecompany.ai/solutions/prompt-intelligence.md) - [You can edit a LinkedIn post. Nobody ever does.](https://llms.knowledgecompany.ai/solutions/linkedin.md) *This document is the markdown mirror of https://knowledgecompany.ai/solutions/substack, published by Knowledge Company - a knowledge freshness platform that detects, verifies and updates outdated claims in company content.* *Mirror index: https://llms.knowledgecompany.ai/index.md - Generated 2026-09-02*