Best On-Premises Anti-Spam Software

Safeguard Microsoft Office 365, Google G Suite, and on-premises email with the industry’s most complete email security solution. Insulate users from spear phishing, credential theft and ransomware attacks by using Email Threat Isolation. Prevent insidious email threats such as spear phishing, ransomware, business email compromise and email spam. Stop spear phishing emails with multiple layers of protection, threat isolation, spam filtering, advanced security email analytics, built-in user awareness, education tools, and more. Block the latest ransomware with content defense, sandboxing, and link protection technologies that detect emerging, stealthy, and zero-day attacks. Defeat business email compromise with impersonation protection, sender authentication enforcement and brand protection controls. Protect your brand reputation by using automation to solve the practical issues of enforcing sender authentication (DMARC, DKIM and SPF) with Symantec Email Fraud Protection.

Blackbox is an email intelligence platform designed to protect email senders and service providers from bad actors and poor sender reputations. It offers exclusive access to a large database of risky email addresses that negatively impact email engagement and sender reputation. The platform uses predictive analytics to identify abusive or low-quality email addresses before they cause deliverability problems or blacklist issues. Blackbox provides a fast, flexible app and API that can be deployed via web or on-premise, allowing email marketers to improve their compliance and email list quality. Its subscription plans range from basic to custom, supporting different volume needs with a 14-day free trial. With features like spam trap detection and real-time risk scoring, Blackbox helps marketers increase revenue while maintaining a clean sender reputation.

Protect your business from disruption, financial loss and reputational damage. Libraesva Email Security stops known and emerging email threats from reaching their target, so you only receive legitimate messages. It provides exceptional email security by integrating cloud email and a secure email gateway with Libraesva’s unique Adaptive Trust Engine that uses AI to learn the usual patterns of behavior for organizations and individuals, continuously assessing the strength of business-to-business trust and proactively holding anomalous traffic. Libraesva Email Security scans and filters all inbound and outbound emails for advanced malware, phishing, business email compromise, spam and more. Proprietary sandboxing technology removes dangerous payloads and active content from attachments, and you can protect users from visiting unsafe sites with active URL analysis that checks every link.

Inbox Spam Filter is a HubSpot-connected SaaS application for teams that handle customer and prospect messages in HubSpot Shared Inbox. It analyzes incoming conversation emails with Google Gemini, assigns configurable spam scores, and displays the scores with AI-generated explanations in an app dashboard. Teams can set a spam threshold, select which shared inboxes to analyze, whitelist domains, and review flagged messages. When enabled, the app can update a HubSpot contact property to mark contacts associated with spam. It is designed for sales, marketing, and support teams seeking to reduce manual review of junk pitches, unwanted messages, and other spam while keeping relevant conversations accessible in their HubSpot workflow. Use requires a connected HubSpot account; message text used for scoring may be sent to Google Gemini for evaluation.