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Vendors.

Browse open-source and commercial software for managed service providers, compare features, and discover cost-saving alternatives.

Secure Email Gateway

Secure Email Gateway

Showing 1-10 of 10 vendors• Open source vendors listed first

Rspamd logo

Rspamd

Secure Email Gateway
High-performance open-source spam filtering with Bayesian learning, fuzzy hashing, and neural network support. Compare Rspamd with other email security tools.
52
123M
Open Source
SpamAssassin logo

SpamAssassin

Secure Email Gateway
Open-source anti-spam platform providing email filtering using heuristic analysis, Bayesian filtering, and DNS blocklists
61
21M
Open Source
Piler logo

Piler

Secure Email Gateway
Open-source email archiving with full-text search, retention policies, and audit-ready compliance tools. Compare Piler for MSP email management.
37
1M
Open Source
MailScanner logo

MailScanner

Secure Email Gateway
Open source email security system for Linux-based email gateways protecting against viruses, spam, phishing, and malware
43
233K
Open Source
MIMEDefang logo

MIMEDefang

Secure Email Gateway
Open-source email filtering framework that works with Sendmail's Milter API to provide customizable mail filtering in Perl.
27
44K
Open Source
Amavis logo

Amavis

Secure Email Gateway
High-performance interface between mailer (MTA) and content checkers like spam and antivirus scanners
50
1
Open Source
Proofpoint Essentials logo

Proofpoint Essentials

Secure Email Gateway
Cloud-based email security for SMBs with advanced threat protection, URL defense, and email continuity. Review Proofpoint Essentials for MSP clients.
74
Commercial Vendor
Mimecast Email Security logo

Mimecast Email Security

Secure Email Gateway
Cloud-based advanced email security platform protecting against sophisticated email attacks, malware, and data loss.
74
Commercial Vendor
Barracuda Email Security logo

Barracuda Email Security

Secure Email Gateway
Comprehensive email security solution protecting against spam, malware, and advanced threats with AI-powered detection.
83
Commercial Vendor
Proxmox Mail Gateway logo

Proxmox Mail Gateway

Secure Email Gateway
Open-source email gateway with spam filtering, virus scanning, and policy-based routing to protect mail infrastructure. Review Proxmox Mail Gateway.
58
Open Source

Frequently Asked Questions

Getting Started

OpenMSP is The MSP Knowledge Hub & Community Platform designed specifically for Managed Service Providers seeking to optimize their technology stack, reduce vendor costs, and discover open-source alternatives. We combine a comprehensive vendor directory, open-source solution catalog, and integrated community discussions to help MSPs make informed decisions.
Yes, completely free. Browse vendors and tools, read comparisons, and join community discussions - no cost, no registration required. OpenMSP is community-supported and focused on empowering MSPs to reduce costs and improve operational efficiency through open-source technology.
We help MSPs identify cost-effective alternatives to expensive commercial solutions, provide transparent vendor information, and connect you with proven open-source alternatives. Our platform enables MSPs to make informed decisions about their technology investments.
No account required for browsing vendors, reading comparisons, or accessing community content. Creating a free account with SSO (Microsoft, Google, or Slack) allows you to participate in discussions and save your favorite tools.

Platform Information

OpenMSP is currently community-supported. We focus on providing value to the MSP community first. Any future monetization will keep the core platform free for MSPs while maintaining our independence and commitment to unbiased information.
We focus exclusively on MSP needs with transparent vendor information and open-source alternatives. No vendor partnerships or sponsored listings - just honest, community-driven information to help MSPs make better technology decisions. Our biggest value is our community where MSPs help each other with questions, setup guidance, and sharing real-world experiences.
Our community of MSP professionals helps verify and update information. We also maintain direct research on tools and vendors to ensure accuracy. Community members can report outdated information, and we work to keep everything current.
OpenMSP was founded by Michael Assraf, who has extensive experience in the MSP industry and product leadership. As the former CEO & Founder of Vicarius, Michael grew a startup from $0 to $9M ARR with 500+ customers and deep experience working with MSPs, partners, and fundraising. OpenMSP represents his commitment to empowering the MSP community through better technology decisions and cost optimization.

Open-Source Tools & Alternatives

We assess tools based on active development, community size, documentation quality, production deployments by MSPs, and available support options. Tools must meet strict criteria for reliability and enterprise readiness.
Many open-source projects offer multiple support options including community forums, commercial support from vendors, professional services, and our community discussions where experienced MSPs share implementation guidance.
Vendor Directory - Find MSP Tools & Software | OpenMSP