Rspamd vs Zerospam
Rspamd
rspamd.comZerospam
zerospam.euSide by side
| Figure | Rspamd | Zerospam |
|---|---|---|
| Price from | £100/mo | €5/mo |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | Yes | — |
| Web | Yes | Yes |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 5 | 3 |
| Spec score · Email Anti-Spam Software | 8.9 (#3) | 7.4 (#17) |
| Company | The site identifies the company as Rspamd Ltd. | The Zerospam site identifies Genesi.IT S.r.l. as the company behind the service. |
| Filtering | It combines reputation, sender authentication, content analysis, and machine learning to score and filter messages. | Its service receives email, filters it, quarantines messages it considers unsafe, and delivers the rest to the mail server. |
| Purpose | Rspamd is an email security engine designed to stop phishing, business email compromise, malicious attachments, and spam. | Zerospam is an external email security service that filters domain mailboxes for spam, phishing, viruses, and malware. |
Plans
Rspamd
- Open-source RspamdFree
- Scale£100 a month
- Scale£100 a month
- EnterprisePriced on request
- HostedPriced on request
In their own words
Rspamd
Rspamd is an email security engine for filtering phishing, business email compromise, malicious attachments, and spam. It scores messages using reputation, sender authentication, content analysis, and machine learning. Authentication checks cover SPF, DKIM, DMARC, and ARC; malware scanning can use ClamAV or commercial antivirus engines. Administrators can define custom rules through the Lua API and configurable maps and selectors. Rspamd works with mail transfer agents including Postfix, Exim, and Sendmail, and its ClickHouse and Elasticsearch integrations provide visibility into attack patterns and detection rates. It is designed for gateway deployment and can run on-premises, keeping message data in the operator's environment without a mandatory vendor cloud. The detection engine is open source under Apache 2.0 and is available for Linux, macOS, and self-hosted use. Rspamd says its event-driven C core scans hundreds of messages per second per core and can scale from a single server to billions of messages a day. The open-source engine is listed at free. Scale costs £100 a month, with 5K mailboxes; hosted and enterprise plans have custom pricing. Premium plans offer support from core engineers, with enterprise SLA options.