Outbound Spam Guard (OSG) Alternatives (September 2025)

Secure your business with total messaging control. Cybonet stops the majority of malicious email threats at your network's perimeter while simultaneously providing a range of additional options for comprehensive security and messaging control.

Symantec Messaging Gateway protects email against spam, malware, targeted attacks and provides advanced content filtering, data loss prevention, and email encryption.

Email security and spam filtering with SpamTitan from TitanHQ uses double AV and AI driven malicious URL detection to block malicious threats

The most comprehensive protection against traditional and targeted attacks. Blocks spam, phishing, and advanced persistent threats (APTs). Flexible hybrid SaaS deployment option.

Fortinet's Email Security Solutions provides protection for your critical business information. Learn how to send Secure Email Gateways (SEG) with FortiMail.

Email Security, Archiving, Encryption, & Awareness Training. Compatible with Office 365. Virus, Phishing, Ransomware & Malware Protection.

The award-winning Clearswift Secure Email Gateway offers an unprecedented level of email security, including cyberattack protection and data loss prevention.

Barracuda Essentials for email security provides IT service providers with complete email security, archiving, e-discovery and backup solution.

MailGuard is a leading Australian technological innovator, providing complete enterprise-grade protection against email security threats such as phishing, ransomware, and BEC. First to stop fast breaking attacks, MailGuard detects and prevents email threats 2-48 hours ahead of the market.

N-able SpamExperts offers professional anti-spam email filtering and archiving for Web hosting providers, Internet Service Providers and Telcos.

N-able Mail Assure offers MSPs AI-driven email security with close to 100% filtering accuracy. Mail Assure also provides continuous uptime and email archiving.

Exceptional Email Security, Email Archiving and Phishing Awareness. Libraesva stops Zero-Day Email Attacks, integrating with M365 and Google

Powerful, effective protection against spam and malware

VIPRE provides email security solutions for every size organization and the IT partners that serve them.

INKY helps companies secure email using a cloud-based security platform that proactively and instantly scans inbound, internal, and outbound emails to eliminate phishing and malware. The platform intelligently eliminates security threats by blocking malicious emails while assisting employees in real time to handle suspicious emails.

Phishing protection including spam filtering, outbound SMTP with DKIM, backup MX services, and Advanced Threat Protection. With 24x7 support included.

Protect your enterprise with best in breed email security from Sendio. Eliminate ransomware, phishing attacks, spam and malware using behavioral technology.

Email security is critical for all organizations. Block all email attacks using Mimecast's advanced email security product with targeted threat protection.

An essential suite of email and web security services for SMB and Enterprise.

MX Layer provides cutting-edge cloud-based solutions for email security, business continuity, data loss prevention, and email archiving services.

Protect your business e-mail from cyberattacks: phishing, ransomware, spam, viruses. Installation in just a few clicks. French solution 🇫🇷

Safeguard your network’s most vulnerable system with anti-virus and anti-spam technologies that block malicious software and spam at the gateway.

Over 90% of targeted ransomware attacks start with a spear phishing attack. But with a single appliance, you can detect and block targeted attacks.

MagicMail is the top selling, carrier-grade email server built for ISPs, Telcos, and Cable companies to manage your back-end services for email.

Real-time link click protection defends against malicious links in emails every time, on every device, from anywhere.

The Barracuda Email Security Gateway is an email security gateway that manages and filters all inbound and outbound email traffic to protect organizations from email-borne threats and data leaks. As a complete email management solution, the Barracuda Email Security Gateway lets organizations encrypt messages and leverage the cloud to spool email if mail servers become unavailable.The Barracuda Email Security Gateway is also available as a virtual appliance or in a public cloud environment (Amazon Web Services, or Microsoft Azure). For…

Intelligent Email Security protects against data breaches by engaging and empowering users without introducing friction.

With Darktrace's self-learning cyber security AI, you're protected against future email attacks that aren’t limited to past attack rules & data. Get a demo.

Trend ScanMail™ for Domino provides comprehensive mail server security with real-time protection and streamlined administration that blocks emails with links to malicious sites.

Award-winning cloud-based email security platform prevents phishing, malware, spoofing, and BEC, from reaching a user’s mailbox. See the Trustifi Difference.

Boost your email security with Proofpoint Essentials and OnDMARC; protect your business against phishing, ransomware, and fraud.

Protect your business network from viruses and threats, secure your work email and Windows file server with AVG business antivirus endpoint security. Download a Free Trial or Buy Online.

A suite of email marketing tools to monitor Inbox placement, Deliverability, IP health and Sender Reputation, compatible with all Email Service Providers.

A powerful email server that blocks 99% of junk emails. It also enables encrypted emailing with large sized file sharing and helps in preventing IP leakages

Prevent malware, ransomware and other threats from compromising your email and your business with Secure Cloud.

Spambrella is your company for managed email security services and User Awareness Training solutions and products. Try our security services for email today!

EmailConsul offers comprehensive email deliverability solutions, including DMARC monitoring, spam traps detection, seedlisting and inbox placement tests, Google Postmaster integration, SNDS integration, IP and domain blocklist monitoring, lookalike detection, and logs monitoring.

SPAMfighter Exchange Module is the award winning Anti Spam and Virus for Exchange Server 2000 - 2016. Try FREE for 30 days.

#1 Open Source Free Anti Spam and Antivirus software. MailCleaner is a gateway between your mail infrastructure and Internet. Block all spam.

Cloudmark is a trusted leader in intelligent threat protection against known and future attacks, safeguarding 12 percent of the world’s inboxes from wide-scale and targeted email threats.

Junk Email Filter - Front End Spam / Virus Filtering for your Existing Email Server. We filter the spam and viruses and pass the good email on to you., Junk Email Filter is a front end hosted spam filtering and virus blocking service. Worlds most advanced spam fighting tools.

Enhance VIPRE Email Security Cloud with unparalleled protection against malicious links and infected attachments.

High performance on-premises appliances that protect organizations across the web, social media, applications and mobile networks.

MailChannels ensures your customers' emails are always delivered. Trusted by the fastest-growing hosting providers.

Prevent sensitive emails from being sent to the wrong person. Confirm external recipients and attachments with this convenient Outlook add-in.

As email is the preferred medium for business communications, preventing confidential information from being leaked in outbound email messages must be a top priority in order to lower the risk of a...

DDoS protection for companies and businesses of any level. No hidden charges, quick activation, 24/7 support. Secure your website, application, or entire networks

Advanced email protection to prevent credential phishing, business email compromise, account takeover, and more.

Detect and block both malicious and malware-less email threats with Proofpoint Email Protection.

Cloud Email Protection, the integrated cloud email security solution from Fortra, stops advanced threats that bypass security defenses and make it into inboxes.

IRONSCALES’ cloud email security software is an AI-powered email platform for enterprise organizations. Our self-learning service protects against advanced email attacks that bypass traditional defenses.

Secure your business emails. Train your employees to cyber attacks. Protect your emails with Mailinblack.

Mesh is the world's first email security platform built exclusively for MSPs, enhancing their efficiency and ensuring greater safety for their customers. Offering flexible deployment options - Mesh Gateway (MX based), Mesh 365 (API based), and Mesh Unified (MX and API based) - Mesh protects organiza

Spambarrier ist ein Dienst, der Ihre E-Mails filtert, bevor sie Ihren Mailserver erreichen. Der einfache Weg, sich vor Spam zu schützen Hosting sicher in Deutschland und datenschutzkonform.

Kaspersky Security for Microsoft Office 365 protects your cloud-oriented enterprise from email-borne threats. Learn how it uses advanced next generation techniques to stop phishing, ransomware, malicious attachments, spam and business email compromise (BEC).

Protect your customers with artificial intelligence with real-time spear phishing protection and cyber fraud defense to prevent personalized attacks.

Mimecast brand protection services combine machine learning and targeted scans to identify potential attacks reduce compromise. Learn more.

Stop advanced email threats and optimize security operations with AI-powered email security that adapts to your organization. Available for on-premise and Microsoft 365.

Guardian Digital has developed unparalleled AI-powered business cloud email security services. Secure your business emails and stay threat-ready today.

Material is a multi-layered detection and response toolkit for email. It stops sophisticated email-based attacks and contains the blast radius of compromised accounts.

GreatHorn is an API, cloud-native email security solution that mitigates the risk of business email compromise across Microsoft 365 and Google Workspace.

Streamline your SPF record management, enable DMARC compliance, and improve your email deliverability by fixing the SPF 10 record limitation.

EmailSuccess is a reliable, fast and secure Mail Transfer Agent capable of delivering huge volumes of emails to the biggest email service providers.

The only deliverability tool you need. Find out why your email is going to spam and protect your sender reputation

Sendio’s Opt-Inbox is a proprietary sender management process that ensures recipients only receive messages from desirable sources.

CloudGuard network security protects public, private, and hybrid-cloud deployments from advanced threats with the highest catch rate of malware and other attacks.

Complete protection against phishing, malware or spam, adding an extra layer of cyber defense for your Microsoft 365, Google Workspace cloud apps and email.

Take back control of your email reputation with award-winning, cloud-based DMARC, DKIM and SPF configuration and management.

Skysnag is the most autonomous DMARC solution. Protect your domain with Skysnag's self serve & managed services.

Leading mail server and webmail client, XGenPlus offering fast, secure, and reliable emailing services supporting linguistic domains - World's first enterprise email solution.

SMX offers a cloud-based email security solution for SEG, archiving and added Microsoft 365 defence. Trusted by enterprises, governments and ISPs across ANZ.

Cost-effective, secure hosted email: mailboxes, calendar and address book

How it works: Avanan adds an invisible layer of full-suite security for cloud email/collaboration, like Office 365, to create universal threat management.

Check the email newsletter spam score. Improve the deliverability of your emails with our free spam checker and tester tool.

Secure Internet Gateway (SIG) provides next generation, cloud-based firewall protection for businesses, MSPs, and MSSPs.

WordPress security plugin done right: firewall and anti-spam, malware scanner, file recovery & integrity checking

Forget all about malware, phishing and identity theft. Guardio cleans, protects, and keeps you and your browser safe.

SMTP email relay service that is powerful, secured and reliable. Send better transactional emails and integrate easily with our email API.

The MDaemon Email Server is trusted by businesses in over 140 countries to provide a secure, reliable, and affordable alternative to Microsoft Exchange or Microsoft 365. IT professionals recommend MDaemon as an easy-to-use, reliable, and secure mail server that does not require expensive administration or impose high per-user costs. On-premise or hosted email deployment.

Protect your business from viruses with AVG Internet Security Business Edition. Includes email and server security, business antivirus, and firewall.

Achieve and maintain DMARC enforcement 4x faster than any other platform with Valimail’s best-in-class email authentication solutions.

Forcepoint Data Loss Prevention (DLP) is an enterprise solution that prevents data exfiltration across all channels, including cloud, email and endpoint. Learn more here.

Radware Bot Manager provides comprehensive protection of web applications, mobile apps and APIs from automated threats like bots.

Reliable, secure, extensible, and customizable mail server software platform made for on-prem and cloud-native deployment; easily scalable, smart licensing.

Enterprise grade AI security platform with a privacy focus. Replace reCAPTCHA v2, v3, or Enterprise with next generation tech at better value. Used by millions.

Be spam free today! Protect your domain from spam and viruses with SpamHero. Removes over 98% of the spam and viruses sent to your domain. Setup takes 5 minutes.

Discover the platform that secures and insures small businesses using AI and a multilayered approach.

Mailprotector has the complete email security products your users need to cover all three comprehensive pillars: email security, encryption, and privacy.

Stop bots and manual spam from reaching you or your customer. All with high accuracy and privacy.

Exchange business-class email helps increase user productivity while protecting your data. Get it as a hosted service or run it on your servers.

Secure Web Gateway (SWG) solutions use web filtering to enforce company Internet access policies. They also filter unwanted software, especially malware, from user-initiated Internet connections.

Easy to Install and manage, carrier class Mail Server Software with modern fast WebMail interface, spam protection and much more.

Nexusguard simplifies DDoS Protection for service providers and enterprises. From cloud services to managed DDoS protection platform to professional training courses, learn how we can help you today.

In the cloud era, network firewalls must do more than secure your network. They must also ensure you have uninterrupted network availability and robust access to cloud-hosted applications.Barracuda CloudGen Firewall is a family of hardware, virtual, and cloud-based appliances that protect and enhance your dispersed network infrastructure. They deliver advanced security by tightly integrating a comprehensive set of Cloud-Generation firewall technologies, including Layer 7 application profiling, intrusion prevention, web filtering, malware and advanced threat protection, antispam protection, and network access…

Industry-leading cloud-native Security Service Edge (SSE) solution enables your workforce and protects your data across web, cloud, email, & private apps.

A server security suite with centralized dashboard containing an AI-powered Linux malware scanner, robust IP reputation, WAF, Spam Detection.

Protect your organization from today’s advanced email threats, business email compromise (BEC), and consumer phishing with Proofpoint's Email Fraud Defense.

Libraesva Email Archiver is a powerful and simple solutionfor email Governance, Risk and Compliance. it provides rapid e-Discovery with instant full-text search.

Cynet’s end-to-end, natively automated XDR platform was purpose-built to enable lean IT security teams to easily achieve comprehensive, effective protection regardless of their resources.