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Comparison · Comms
Rspamd vs Threema
A side-by-side editorial comparison of Rspamd and Threema — release velocity, themes, recent moves, and the top alternatives to consider.
Rspamd vs Threema: at a glance
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 Threema?
Threema ships a rare app change: spam reports for any chat on Android and iOS
On 13 November Threema improved spam reporting so users can flag single and group chats as spam on all mobile platforms, a change it credits to feedback from its in-app survey feed. It is the first app-level change in this window; the rest of the feed since July is security commentary, an August DDoS incident post and two Threema Work admin features.
Rspamd vs Threema: 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.
Threema
5.0COMMS
Threema ships a rare app change: spam reports for any chat on Android and iOS
◆ Current state
On 13 November Threema improved spam reporting so users can flag single and group chats as spam on all mobile platforms, a change it credits to feedback from its in-app survey feed. It is the first app-level change in this window; the rest of the feed since July is security commentary, an August DDoS incident post and two Threema Work admin features.
◆ Where it's heading
Product news is starting to surface in the consumer app as well as in Threema Work administration, but at a slow pace and in small steps. The editorial line stays on security and resilience, with recent posts pitching Threema as the fallback channel during cyberattacks.
◆ Prediction
Expect further small, feedback-driven app changes alongside security commentary; the entries do not show when the larger items teased in July's roadmap post will ship.
Alternatives to Rspamd and Threema
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 Threema.
Twilio
Twilio's voice AI stops cutting callers off mid-sentence, using its own turn-taking model.
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.
See all Rspamd alternatives → · See all Threema alternatives →
Recent activity from Rspamd and Threema
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1d agoRspamd4.3.0: SPF order fix, stricter DKIM, new truncation symbols
- 1d agoThreemaImproved Spam Reporting for Android and iOS
- 12d agoThreemaWhen Systems Go Silent: Staying Connected During a Cyberattack
- 24d agoRspamd4.2.3: ARC trust fix, merged RBL queries, browser-style HTML parsing
- 26d agoThreemaWhat’s behind the current wave of cyberattacks?
- 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
- 3mo agoThreemaDDoS Attacks on Threema
- 3mo agoThreemaMessenger Interoperability: Well-Intended, but Bad for Data Privacy
- 3mo agoThreemaEasier Tag Management in the Management Cockpit
Frequently asked questions
What is the difference between Rspamd and Threema?
They serve adjacent needs but don't currently overlap on shipped themes. Rspamd and Threema 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 Threema?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. Rspamd and Threema 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 Threema?
Top Threema alternatives in Comms are ranked by recent ship velocity. Browse the "Threema alternatives" section above for the current picks, or visit /alternatives/threema for the full list with editorial commentary on each.