gpg4o vs RMail

gpg4o is a Microsoft Outlook add-in for encrypting, decrypting, signing, and checking messages and attachments. It uses public and private keys under the OpenPGP standard, and supports encrypted HTML email, PGP/MIME, and PGP/Inline. Its key management can synchronize keys, use local or public key servers, and check the Web of Trust; central management requires Enterprise KeyServer. The product also supports terminal servers, Microsoft Policy Manager, automatic key generation, and working groups. When encryption is enabled, it protects message text and attachments, but not the subject line or recipient list. The current feature page lists Outlook 2024 or 365 Classic on Windows 11 and marks Mac OS unsupported. A limited free version is available without a time limit, and a 180-day trial is noted. The listed gpg4o plan costs €99.95 a month. After maintenance expires, users can still send and read encrypted or signed email, but they do not receive further updates.

RMail is a paid email service for protected message and attachment delivery. It supports delivery by attachment, password-based recipient verification, and message expiry. The attachment limit is 10. RMail runs on the web, Windows, and macOS, with Outlook and Gmail integrations and admin access controls. RMail, the maker, was founded in 2000. Four plans are listed, although prices are not provided: RMail Personal includes 25 units per month; Standard includes 200 units per month; and Business includes 500 units per month. Enterprise lists Email Eavesdropping Alerts, Custom Integrations, SSO, and a Cloud Email Security Gateway. The plan structure therefore separates monthly unit allowances from enterprise-oriented controls and integrations. Password verification and expiry address recipient access, while the Outlook and Gmail connections fit users working through those services. The listed pricing model is paid, and no plan price is stated.