FlowCrypt vs PDF Postman

FlowCrypt is an email encryption service that lets users send encrypted messages to OpenPGP users and password-protected messages to other recipients. Recipients can reply securely without installing a plugin. It is offered as a Chrome extension, with other platforms and a mobile application also listed. Gmail and Outlook integration are listed, along with message expiry and password-based recipient verification. The free plan is for fewer than 100 users and lists a 5 MB attachment threshold, while product details say free users can add attachments up to 25 MB. Enterprise supports domains with more than 100 users, and administrators can set domain-wide controls and enforce rules for passphrases, keys, and signing. Enterprise also supports SSO through Google, OIDC providers, and delegated identity providers, and can connect with public key servers, HSMs, and internal systems. Enterprise commercial-use pricing requires contacting FlowCrypt. Its enterprise data processing agreement is described as GDPR-compliant, and enterprise support includes an SLA for availability and response times for fixes and patches.

PDF Postman is a Windows Outlook add-in that turns email messages and attachments into password-protected PDF files. It encrypts messages and attachments using AES-128 or AES-256. Recipients can open encrypted PDFs with a PDF viewer and password, without special software or registration. The add-in converts HTML, rich-text or text messages into formatted PDFs. Users can include encrypted attachments in a PDF, protect attachments without the message, or make PDFs from attached files. The download page lists Outlook Desktop 365, 2021, 2019, 2016 and 2013 on 32-bit or 64-bit Windows, with Windows 11 or 10,.NET Framework 4.8 or later, 4 GB RAM and 2 GB of disk space as requirements. After a 15-day trial, it reverts to a free mode limited to five encrypted PDF messages per month. Listed paid options range from $79.99 a month for one license to $3,999 a month for 100 licenses; licenses are perpetual, with maintenance and upgrades optionally renewable at 25%. The maker says email remains on the user's PC rather than being sent to the cloud.