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Comparison · Comms
Rspamd vs Superhuman
A side-by-side editorial comparison of Rspamd and Superhuman — release velocity, themes, recent moves, and the top alternatives to consider.
Rspamd vs Superhuman: at a glance
| Feature | Rspamd | Superhuman |
|---|---|---|
| Sector | Comms | Comms |
| Velocity score | 5.0 | 5.0 |
| Sparks · 30d | 0 | 0 |
| Top themes | spam filtering, email authentication, input hardening, attachment extraction | email, mcp, ai assistant, team admin |
| Last editorial update | 3h ago | 2d ago |
| Website | Visit → | — |
What is Rspamd?
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
Rspamd 4.3.0 on November 13 is a correctness release with a long incompatible-changes list. SPF records are now evaluated in term order, closing a case where an explicit -ip4 deny could be overridden by a broader allow. DKIM rejects RSA keys under 1024 bits and signatures with duplicate tags, DMARC no longer drops a policy over an unknown tag, URL mismatches are scored apart from phishing, and PDF text extraction and archive unpacking change their output. Critical fixes cover a header line that could abort a worker from one unauthenticated HTTP request.
What is Superhuman?
Superhuman's MCP now lets Claude and ChatGPT attach files, set reminders and share threads.
Superhuman is a premium email client building a calendar, team comments and AI around its mail core. On 11 November its Mail MCP gained four abilities in Claude, ChatGPT and other AI tools: setting follow-up reminders, sending attachments, using private and team snippets, and sharing threads for team comments. The MCP stays on Business and Enterprise plans, a week after a team admin console reached every plan.
Rspamd vs Superhuman: editorial side-by-side
Rspamd
5.0COMMS
Rspamd 4.3 fixes SPF evaluation order and rejects weak DKIM keys, with results that change.
◆ Current state
Rspamd 4.3.0 on November 13 is a correctness release with a long incompatible-changes list. SPF records are now evaluated in term order, closing a case where an explicit -ip4 deny could be overridden by a broader allow. DKIM rejects RSA keys under 1024 bits and signatures with duplicate tags, DMARC no longer drops a policy over an unknown tag, URL mismatches are scored apart from phishing, and PDF text extraction and archive unpacking change their output. Critical fixes cover a header line that could abort a worker from one unauthenticated HTTP request.
◆ Where it's heading
Since 4.1, every release has hardened parsers and closed memory-safety and trust gaps; 4.3 applies the same pass to the authentication standards themselves (SPF, DKIM, DMARC, ARC) and to content extraction. Operators should expect scores and fuzzy hashes to shift after upgrading, because the project now favours spec-correct results over backward-compatible ones.
◆ Prediction
A 4.3.x point release fixing regressions from these behaviour changes is the likely next step, as 4.2.1 followed 4.2.0 within two weeks.
Superhuman
5.0COMMS
Superhuman's MCP now lets Claude and ChatGPT attach files, set reminders and share threads.
◆ Current state
Superhuman is a premium email client building a calendar, team comments and AI around its mail core. On 11 November its Mail MCP gained four abilities in Claude, ChatGPT and other AI tools: setting follow-up reminders, sending attachments, using private and team snippets, and sharing threads for team comments. The MCP stays on Business and Enterprise plans, a week after a team admin console reached every plan.
◆ Where it's heading
Superhuman is making its mail features callable from outside AI assistants rather than only from its own app. Each MCP addition maps an existing Superhuman feature, such as reminders, snippets or shared comments, onto a tool an assistant can use, with sharing gated on the user's confirmation. Keeping the MCP on paid team plans ties it to the admin and usage reporting shipped the week before.
◆ Prediction
More Superhuman features exposed through the MCP is the likely next step, with calendar and Auto Labels the obvious gaps; the entries do not show whether the MCP will reach lower plans.
Alternatives to Rspamd and Superhuman
Other Comms products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either Rspamd or Superhuman.
Salesmsg
Salesmsg adds call-back requests and a one-click Emergency Stop for all outbound texts.
Element
Element 1.12.35 follows the call picture-in-picture release with one desktop storage fix.
Krisp
Krisp moves call transcripts and live captions to cloud transcription in KrispCX 2.84.4.
Misskey
Misskey 2026.11 ships: a leaner start script, and Node.js 22 no longer boots.
SlickText
SlickText's feed is all SMS buying guides; no product release has surfaced since RCS.
See all Rspamd alternatives → · See all Superhuman alternatives →
Recent activity from Rspamd and Superhuman
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 22h agoRspamd4.3.0: SPF order fix, stricter DKIM, new truncation symbols
- 2d agoSuperhumanSnippets in Claude, ChatGPT, and MCP ✂️
- 2d agoSuperhumanSharing & Commenting in Claude, ChatGPT, and MCP 🗯️
- 2d agoSuperhumanReminders in Claude, ChatGPT, and MCP ⏰
- 2d agoSuperhumanAttachments in Claude, ChatGPT, and MCP 📎
- 9d agoSuperhumanAdmin Tools 🛠️
- 21d agoSuperhumanSuperhuman Mail for iPhone Duo
- 24d agoRspamd4.2.3: ARC trust fix, merged RBL queries, browser-style HTML parsing
- 1mo agoRspamd4.2.2: crypto wallet detection and changed MIME digests
- 1mo agoRspamd4.2.1: critical HTTP and memory-safety fixes
- 1mo agoRspamd4.2.0: public suffix lookup and attachment content extraction
- 3mo agoRspamdCloses an arbitrary file read reachable by any TCP client
Frequently asked questions
What is the difference between Rspamd and Superhuman?
They serve adjacent needs but don't currently overlap on shipped themes. Rspamd and Superhuman are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is Rspamd better than Superhuman?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Rspamd and Superhuman are shipping at a similar cadence (velocity 5.0 vs 5.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other Comms products to evaluate alongside.
What are the best alternatives to Rspamd?
Top Rspamd alternatives in Comms are ranked by recent ship velocity. Browse the "Rspamd alternatives" section above for the current picks, or visit /alternatives/rspamd for the full list with editorial commentary on each.
What are the best alternatives to Superhuman?
Top Superhuman alternatives in Comms are ranked by recent ship velocity. Browse the "Superhuman alternatives" section above for the current picks, or visit /alternatives/superhuman for the full list with editorial commentary on each.