One Email, Three Identities: SPF, DKIM and DMARC Explained
← All articles Insight One Email, Three Identities: SPF, DKIM and DMARC Explained 10 Aug 2026 · 8 min read A single email carries three separate domain identities, plus the IP address it was actually delivered from, and nothing requires any of them to match. Most of the confusion around SPF, DKIM and DMARC comes from assuming there is one "sender" to check. There are three identities, they are checked by different mechanisms, and a message can pass DMARC while two of the three point in different directions.
- ▪← All articles Insight One Email, Three Identities: SPF, DKIM and DMARC Explained 10 Aug 2026 · 8 min read A single email carries three separate domain identities, plus the IP address it was actually delivered from, and nothing requires any
- ▪Most of the confusion around SPF, DKIM and DMARC comes from assuming there is one "sender" to check.
- ▪There are three identities, they are checked by different mechanisms, and a message can pass DMARC while two of the three point in different directions.
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| Original publisher | SenderLedger |
| Canonical URL | https://senderledger.com/articles/one-email-three-identities-spf-dkim-dmarc |
| Publication time | Mon, 10 Aug 2026 09:55:53 +0000 |
| Retrieval time | 2026-08-10T11:15:42.942Z |
| Last seen | 2026-08-10T11:15:42.942Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | zdrR160jYTas · 1 stories |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
← All articles Insight One Email, Three Identities: SPF, DKIM and DMARC Explained 10 Aug 2026 · 8 min read A single email carries three separate domain identities, plus the IP address it was actually delivered from, and nothing requires any of them to match. Most of the confusion around SPF, DKIM and DMARC comes from assuming there is one "sender" to check. There are three identities, they are checked by different mechanisms, and a message can pass DMARC while two of the three point in different directions. Here is a constructed example (not a real customer message, but a realistic and common configuration) that shows all of them at once: an invoice email sent through an email service provider (ESP), the way most SaaS billing systems actually send mail.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at SenderLedger.
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