Best Email Encryption Software for Windows of 2025

Compare the Top Email Encryption Software for Windows as of July 2025

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What is Email Encryption Software for Windows?

Email encryption software ensures the confidentiality and integrity of email communications by converting messages into unreadable formats that can only be decrypted by authorized recipients. It uses encryption protocols such as S/MIME and PGP to protect sensitive information from interception, eavesdropping, and unauthorized access. The software helps organizations comply with data privacy regulations like GDPR, HIPAA, and CCPA by securing emails containing personal or financial information. Email encryption can be applied at the message level, attachment level, or entire inbox, providing versatile protection for both internal and external communications. By safeguarding email content, businesses can reduce the risk of data breaches, maintain customer trust, and avoid costly compliance fines. Compare and read user reviews of the best Email Encryption software for Windows currently available using the table below. This list is updated regularly.

1

RMail

RPost

RMail® is the e-security platform by RPost®, a global leader since 2000. RMail specializes in elegantly easy to use email encryption for privacy and compliance, e-signatures, legal e-delivery proof, secure file sharing, email impostor protection, document rights management, and AI-infused services to prevent data leaks and human e-security errors. RMail’s transmission e-security services are most often used by businesspeople or business systems that send important, sensitive, or consumer-regulated information. These RMail services are generally applied to those messages where the sender needs functionality beyond standard email in terms of (a) easier to use and more automated email encryption for privacy compliance, (b) returning a verifiable proof record of who said what to whom by email, (c) assurance and peace of mind related to delivery and open status of important and time-deadline email, (d) need a timestamped proof of content delivered, (f) need to share large files securely.

Starting Price: $7/month/user

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2

Z1 SecureMail Gateway

Zertificon

25% of the 100 German companies with the highest turnover choose Zertificon. Z1 SecureMail Gateway is our highly automated Enterprise Email Encryption solution for effortless, secure communications with anyone, anywhere. Your entire organization encrypts and decrypts, just as well manages & verifies email signatures smoothly in the background. Z1 SecureMail Gateway requires minimal maintenance. And the browser-based admin interface needs no special skills. Keys are managed automatically & central policies enforce security. Integration is fast into your Cloud or On-premises email infrastructure. Your workflows and business are uninterrupted — no employee training needed plus frictionless experience for recipients. With Z1 SecureMail Gateway, encryption is centrally configurable and proofed against human error. You easily achieve and maintain compliance and the highest security standards. You also own all encryption keys and attain German-engineered data sovereignty with no backdoors.

Starting Price: from $ 1.50 per user/per month

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3

Cryptshare

Cryptshare

Cryptshare is innovation to protect your information when most at risk. We all need to send messages and data in our daily business. However, we face many limitations, as soon as data is in transit: 1. Protection of data 2. File size limitations Our solution solves these in a very effective and user-friendly way. It brings many other benefits including: *Detailed audit trail *Compliance with central data protection regulations *Great potential for automating business communication *It is also inexpensive, easy to implement, and accessible from any kind of device with a browser. Cryptshare complies with ISO 27001 and GDPR. Cryptshare keeps your information secure all the way.

Starting Price: €5 per user per month

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4

EncryptTitan

TitanHQ

EncryptTitan is a 100% cloud based encryption system for MSPs & Enterprises that allows users to exchange information securely via email.  EncryptTitan provides organizations with the tools needed to adhere to state and federal privacy regulations while protecting their organization. EncryptTitan has pre-built DLP policies and settings that will look for regular content in the message body or attachment to automatically encrypt messages. Meet compliance requirements for protecting sensitive, private information. Providing data breach protection and avoiding costly fines and penalties. The outlook plug in can be used with our keyword encryption deployment, where the user can select which emails to be encrypted for the add in. EncryptTitan helps the safeguarding of private information & avoidance of litigation & bad press which can impact customer trust. Book your demo today and learn more about EncryptTitan.

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