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Online Email Security Software

Last updated: March 2026

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125 software options

ContentCatcher logo

ContentCatcher

Cloud-based email security, phishing protection & anti-spam

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ContentCatcher is a web-based SaaS solution offering email security, encryption, anti-spam, phishing protection and compliant archiving to assist organizations of all levels to combat and mitigate malicious email threats, with features including anti-virus, filtering, URL defense, reporting and more

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Guardz logo

Guardz

Cybersecurity solution

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Guardz is a managed cybersecurity solution built for MSPs to holistically protect and provide insurance coverage to SMEs with a holistic and multilayered approach.

The Guardz platform continuously monitors businesses' digital landscapes to safeguard their assets.

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Libraesva Email Security logo

Libraesva Email Security

Category Leaders

Exceptional Email Security

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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.

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Fortra's Cloud Email Protection logo

Fortra's Cloud Email Protection

Defend against advanced phishing attacks.

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With Agari Phishing Defense, users can prevent breach activity at the cloud gateway and proactively protect users from impersonation attacks.

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Fortra’s DMARC Protection logo

Fortra’s DMARC Protection

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Software for protection from spoofing and phishing attacks

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Agari Brand Protection is a simple anti-phishing solution that helps enterprises prevent and recover from email spoofing attacks. Businesses can block phishing attacks with DMARC, SPF, DKIM, and other email authentication services.

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EasyDMARC logo

EasyDMARC

Email security and deliverability platform

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EasyDMARC is a comprehensive cloud-native platform designed to simplify email authentication and deliverability management. With its intuitive interface, it offers in-depth visibility into users' email ecosystems, allowing them to monitor traffic, analyze authentication results, and protect their domain's reputation.

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Virtru logo

Virtru

Cloud-based data privacy and security platform

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Virtru has email and data encryption solutions for organizations of all sizes across all industries including healthcare, government, education, manufacturing, aerospace and defense, finance, IT services, Media and more.

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Heimdal Email Security logo

Heimdal Email Security

Email Protection in a Redefined Spam Filter

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Heimdal Email Security is an email protection solution that combines advanced spam filtering with robust malware prevention through a multitude of modern technologies.

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Fidelis Network logo

Fidelis Network

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Fidelis' NDR: Proactive Defense, Rapid Threat Response.

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Fidelis Network, an NDR solution, delivers real-time threat detection & response. With Deep Session Inspection®, it provides full visibility into network, email, and web traffic, including encrypted data. Contextual analysis & threat intelligence reduce alert fatigue & enhance risk management.

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ESET Endpoint Security logo

Network security, network monitoring & endpoint protection

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ESET Email Security protects email communications for organizations with 250+ employees. Available as cloud-based and on-premises, it ensures internet security and malware protection. Features include mail protection, cloud sandbox technology, remote device management and firewall configuration.

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Zoho Mail logo

Zoho Mail is a secure, encrypted, and enterprise-ready email

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Zoho Mail, a business-oriented and privacy-guaranteed email service, is your single email solution. Zoho Mail also comes bundled with modern collaborative tools and a suite of apps to meet your business needs. Migrate now and get your unique email address with Zoho Mail.

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Cloudflare logo

Performance & Security for Any Website

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Cloudflare protects and accelerates million of website online using a single change to your DNS by offering CDN functionality and advanced security.

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Hoxhunt logo

Make security training engaging, personalized, and effective

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Hoxhunt is a security awareness training software designed to help businesses educate and train employees to identify and report phishing attacks or malicious emails. Administrators can create relevant content to automatically send personalized malicious emails to employees.

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SpamTitan logo
Category Leaders

Anti-spam filter for business email. Vital email security.

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SpamTitan blocks spam, viruses, malware, ransomware, phishing attempts and other email threats. SpamTitan provides advanced yet easy to use email security for your business. Office 365 friendly

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SendGrid logo
Category Leaders

Delivers reliable email at scale for businesses

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SendGrid is a solution that provides a cloud-based email infrastructure to help relieve businesses of the cost and complexity of maintaining custom email systems. It provides email delivery, scalability and real-time analytics along with APIs. The platform also offers SMTP service, email validation, deliverability insights, and dynamic templates, while supporting multiple programming languages including Node.js, Python, and Java.

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Microsoft Defender for Office 365 logo
Category Leaders

Cloud-based email security and threat management software

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Microsoft Defender for Office 365 is a cloud-based email security software designed to help businesses automatically detect, investigate, and resolve potential email threats on a centralized platform. Supervisors can configure security policies, perform spoof checks, and maintain a record of reported incidents.

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AVG Internet Security Business Edition logo
Category Leaders

Cybersecurity platform for small and midsize businesses

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AVG Internet Security Business Edition is a complete protection solution that helps small and midsize businesses keep their systems and devices safe from external threats.

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Zerospam logo

Cloud email security & anti-spam solution

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ZEROSPAM is a complete cloud email security and anti-spam solution that protects domains against spam, ransomware, spear phishing, viruses, phishing and all harmful emails. Detect disguised executable files & infected macros sent as attachments via emails or downloaded through a malicious link.

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NeoCertified logo
Category Leaders

Secure email for confidential & sensitive documents

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NeoCertified provides secure email encryption with Outlook integration for businesses of all industries, including healthcare, finance, legal & education

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Selzy logo

Affordable email marketing software

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Selzy is an intuitive email marketing platform that suits any business needs. It offers a wide range of integrations with your favorite tools, an easy-to-use drag&drop editor, and email templates for any occasion.

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Cypherdog Encryption logo
Category Leaders

One click. Complete protection.

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Cypherdog Encryption (CE) provides the ability to encrypt and decrypt e-mails with attachments with confirmation of the identity of the parties to the communication.

No "trusted" third party, zero-knowledge security model, asymmetric encryption.

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Symantec Email Security.cloud logo

Anti-spam and email security software

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Symantec Email Security.cloud is an anti-spam software designed to help businesses filter unwanted messages and protect the system from email-borne viruses. The platform offers data loss prevention functionality, which enables managers to encrypt and control sensitive data.

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Proton Mail logo

Web-based email management platform

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ProtonMail is a web-based email management platform that helps businesses securely transmit encrypted emails between users both inside and outside of the organisation.

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DNSFilter logo

Cloud-based cybersecurity and network monitoring platform

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DNSFilter is a cybersecurity management software that enables enterprises, K-12 schools, and universities to detect online security threats and malware using artificial intelligence (AI) technology, machine learning (ML) algorithms, and content filtering capabilities.

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Topsec Cloud Solutions logo

Your Managed Email Security Specialists

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Topsec Email Security is a complete email filtering solution that helps organizations to check all their incoming and outgoing email content for virus and spam.

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