Sites like Rspamd

01 · Entity

About Rspamd

Rspamd rspamd.com

Rspamd — Email Security System

Rspamd is an email-security engine that stops phishing, business email compromise, malware, and spam for enterprises, ESPs, and hosting providers. Open-source detection core with premium support and SLAs.

Wikidata: open source spamfilter

Top 10K · #2,637 English 2 technologies Crawled Nov 6, 2026

Visit Rspamd

Summary by Claude

Rspamd is an open-source email filtering engine for mail servers that detects spam, phishing, malware and business email compromise using reputation checks, sender authentication, content rules and machine learning, with paid premium support plans.

Who it’s for

Mail server administrators, enterprises, ESPs, hosting providers

Business model

Open source with paid support subscriptions

• email spam filtering
• spam filter for mail servers
• SPF DKIM DMARC ARC validation
• DNS blocklists RBL URIBL
• ClamAV antivirus integration
• Bayesian and neural spam classification
• SpamAssassin migration
• greylisting and rate limiting
• Postfix milter integration

02 · Embedding space

Competitor map

Each alternative by how close its vector is to Rspamd’s (x) and how much traffic it gets, how much of the stack it shares, or where it sits in the embedding space itself (y). Lines split each axis at the median. Hover for the numbers, click to jump to it in the list.

1. 01
   URIBL.COM uribl.com Top 10K English

   URIBL.COM - Realtime URI Blacklist

   URIBL.COM is a Realtime URI Blacklist (RHSBL) served via DNS to identify Unsolicitied Bulk and Commercial Email (UCE/UBE) based on the links within the email. URIBL.COM is enabled by default in the popular opensource SpamAssassin.

   • nginx
   • Google Analytics

   0 say URIBL.COM is a good alternative to Rspamd 0 say URIBL.COM isn’t a real alternative to Rspamd

   Comment
   Very close cos 0.903
2. 02
   Akismet akismet.com Top 10K English

   Akismet: Spam Protection for Websites

   Say goodbye to spam with Akismet – the ultimate spam protection used by millions of websites. Sign up today and never worry about spam again!

   • nginx
   • Google Search Console
   • Meta Pixel
   • PHP
   • SendGrid
   • WordPress

   0 say Akismet is a good alternative to Rspamd 0 say Akismet isn’t a real alternative to Rspamd

   Comment
   Close cos 0.890
3. 03
   Spamhaus spamhaus.org Top 1K English

   Strengthening trust and safety across the internet | Spamhaus

   Strengthening trust and safety online through IP and domain reputation intelligence, expertise, education, and community collaboration.

   • Google Fonts
   • Algolia
   • Cloudflare
   • Google Search Console
   • Google Tag Manager
   • Nuxt

   0 say Spamhaus is a good alternative to Rspamd 0 say Spamhaus isn’t a real alternative to Rspamd

   Comment
   Close cos 0.885
4. 04
   Mailchimp mailchimp.com Top 1K English

   Email & SMS Marketing Platform | Mailchimp

   Utilize real-time user behavior data and artificial intelligence to convert more customers. Easy to use, get started for free!

   • Adobe
   • Adobe Experience Manager
   • Akamai
   • Akamai Bot Manager
   • Akamai Edge DNS
   • Apple Business

   0 say Mailchimp is a good alternative to Rspamd 0 say Mailchimp isn’t a real alternative to Rspamd

   Comment
   Close cos 0.875
5. 05
   Fastmail fastmail.com English

   Email and calendar made better | Fastmail

   Fast, private email hosting for you or your business. More productive, lightning fast, simple and built to save you time.

   • Cloudflare
   • Fastmail

   0 say Fastmail is a good alternative to Rspamd 0 say Fastmail isn’t a real alternative to Rspamd

   Comment
   Close cos 0.875
6. 06
   Temp Mail temp-mail.org Top 10K English

   Website

   • Cloudflare
   • Cloudflare DNS
   • Cloudflare Web Analytics
   • Google Search Console

   0 say Temp Mail is a good alternative to Rspamd 0 say Temp Mail isn’t a real alternative to Rspamd

   Comment
   Close cos 0.869
7. 07
   Drupal drupal.org Top 10K English

   Client Challenge

   free and open-source web content management system

   • Amazon SES
   • Atlassian
   • Fastly
   • GlobalSign
   • Google Search Console
   • Mailchimp

   0 say Drupal is a good alternative to Rspamd 0 say Drupal isn’t a real alternative to Rspamd

   Comment
   Close cos 0.870
8. 08
   RustDesk rustdesk.com Top 10K English

   RustDesk: Open-Source Remote Desktop with Self-Hosted Server Solutions

   RustDesk is open-source remote desktop software for your own self-hosted server, a TeamViewer and AnyDesk alternative for Windows, macOS, Linux and Android.

   • Amazon SES
   • Astro
   • Cloudflare
   • Cloudflare DNS
   • Google Analytics
   • Google Search Console

   0 say RustDesk is a good alternative to Rspamd 0 say RustDesk isn’t a real alternative to Rspamd

   Comment
   Close cos 0.868
9. 09
   MailerLite mailerlite.com Top 10K English

   Create Email Marketing Your Audience Will Love - MailerLite

   Digital marketing tools to grow your audience faster and drive revenue smarter. Backed by 24/7 award-winning support. Check it out now!

   • Algolia
   • Cloudflare
   • Cloudflare DNS
   • Google Cloud
   • Google Search Console
   • Google Workspace

   0 say MailerLite is a good alternative to Rspamd 0 say MailerLite isn’t a real alternative to Rspamd

   Comment
   Close cos 0.867
10. 10
    ISPConfig ispconfig.org Top 10K English

    ISPConfig – Hosting Control Panel

    ISPConfig is an open source hosting control panel for Linux. Manage websites, email, DNS, databases and users on one server or a whole multiserver setup.

    • Amazon SES
    • Cloudflare
    • Cloudflare DNS

    0 say ISPConfig is a good alternative to Rspamd 0 say ISPConfig isn’t a real alternative to Rspamd

    Comment
    Close cos 0.865
11. 11
    Sender Score senderscore.com Top 10K English

    Sender Score - Email Marketing Education and Free Tools

    Email doesn't have to be complicated. Assess where you are today, learn how to improve, and leverage free tools and education.

    • Adobe Fonts
    • cdnjs
    • Cloudflare
    • Font Awesome
    • Google Tag Manager
    • jQuery

    0 say Sender Score is a good alternative to Rspamd 0 say Sender Score isn’t a real alternative to Rspamd

    Comment
    Close cos 0.865
12. 12
    mail.com Top 10K English

    Free email accounts | Register today at mail.com

    Email how it is supposed to be: ✔ Free, simple and secure ✔ Manage multiple mail accounts in one place, from any device ✔ Sign up today!

    • nginx
    • Google Search Console
    • Google Tag Manager
    • Meta Business Suite

    0 say mail.com is a good alternative to Rspamd 0 say mail.com isn’t a real alternative to Rspamd

    Comment
    Close cos 0.869
13. 13
    Mimecast mimecast.com Top 10K English

    Human Risk Management & Advanced Email Security | Mimecast

    Protect email and collaboration tools with Mimecast. Manage human risk and stay ahead of cyber threats with advanced security solutions.

    • ASP.NET
    • Atlassian
    • Azure Front Door
    • DocuSign
    • GlobalSign
    • Google Search Console

    0 say Mimecast is a good alternative to Rspamd 0 say Mimecast isn’t a real alternative to Rspamd

    Comment
    Close cos 0.863
14. 14
    getcomposer.org Top 10K English

    Composer

    A Dependency Manager for PHP

    • nginx
    • Google Search Console
    • Google Workspace
    • Amazon Route 53

    0 say getcomposer.org is a good alternative to Rspamd 0 say getcomposer.org isn’t a real alternative to Rspamd

    Comment
    Close cos 0.862
15. 15
    Bitwarden bitwarden.com Top 10K English

    Best Password Manager for Business, Enterprise & Personal | Bitwarden | Bitwarden

    Bitwarden is the trusted, open source password manager for individuals, teams, and enterprises. Securely store, share, and manage passwords, passkeys, and secrets. Free to start.

    • Amazon SES
    • Atlassian
    • Cloudflare DNS
    • Google Search Console
    • Google Tag Manager
    • Google Workspace

    0 say Bitwarden is a good alternative to Rspamd 0 say Bitwarden isn’t a real alternative to Rspamd

    Comment
    Close cos 0.862
16. 16
    Register.com register.com Top 10K English

    Cloudflare Captcha Page | Register.com

    American domain name registrar

    • Adobe Experience Manager
    • Cloudflare
    • Cloudflare DNS
    • Google Search Console
    • Meta Business Suite
    • Microsoft 365

    0 say Register.com is a good alternative to Rspamd 0 say Register.com isn’t a real alternative to Rspamd

    Comment
    Close cos 0.864
17. 17
    AMP ampproject.org Top 1K English

    AMP - a web component framework to easily create user-first web experiences - amp.dev

    Whether you are a publisher, e-commerce company, storyteller, advertiser or email sender, AMP makes it easy to create great experiences on the web. Use AMP to build websites, stories, ads and emails.

    • GlobalSign
    • Google Search Console
    • Google Workspace
    • Netlify

    0 say AMP is a good alternative to Rspamd 0 say AMP isn’t a real alternative to Rspamd

    Comment
    Close cos 0.859
18. 18
    phpMyAdmin phpmyadmin.net Top 10K English

    phpMyAdmin

    database administration tool

    • Google Analytics
    • Google Search Console

    0 say phpMyAdmin is a good alternative to Rspamd 0 say phpMyAdmin isn’t a real alternative to Rspamd

    Comment
    Close cos 0.861
19. 19
    DataDome datadome.co Top 10K English

    datadome.co

    cybersecurity company

    • Apple Business
    • Atlassian
    • Amazon CloudFront
    • DataDome
    • DocuSign
    • Google Search Console

    0 say DataDome is a good alternative to Rspamd 0 say DataDome isn’t a real alternative to Rspamd

    Comment
    Close cos 0.858
20. 20
    SlideShare slideshare.net Top 1K English

    Client Challenge

    American hosting service, owned by Scribd, for professional content including presentations, infographics, documents, and videos

    • Fastly
    • Google Search Console
    • Google Workspace
    • Amazon Route 53

    0 say SlideShare is a good alternative to Rspamd 0 say SlideShare isn’t a real alternative to Rspamd

    Comment
    Close cos 0.860

Ranked by score: the cosine similarity of each site’s vector to rspamd.com’s, less a small penalty for generic sites that are close to everything. Highlighted technologies are ones Rspamd uses too. Votes and comments come from visitors and don’t change the ranking.

04 · Fingerprints

Technology

What Rspamd is built with, and what its closest competitors use, from its homepage’s code and its DNS records.