Rspamd vs Scrollout F1

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.

Scrollout F1 is a free email gateway that adds anti-spam and anti-virus protection to existing mail servers. It lists Microsoft Exchange, Lotus Domino, Postfix, Exim and Qmail among compatible servers, and one installation can protect unlimited domain names and email servers. Mail controls include DKIM signing and verification, SPF verification with SRS for forwarding, DMARC support and recipient checks through Active Directory or LDAP. Filtering covers executable files, malicious content, scripts, forged domains and invalid or unknown hosts. Routing features include smarthost relaying, per-domain outbound IP pools, backup delivery and fallback to alternative servers. The gateway offers separate quarantines, per-domain spam scoring, TLS 1.2 and an option to require encrypted server connections. Deployment options include Hyper-V, VMware, VirtualBox, KVM, XEN and bare metal; OpenVZ is not supported. It is available as a 64-bit ISO or install-from-scratch option, both requiring internet access during installation. The maker describes it for Linux and Windows administrators without advanced email security experience.