Aerion (Portable)

Aerion (Portable) lets you manage personal or work email from one lightweight, standalone client while keeping mail handling separate from GNOME Online Accounts and other system services. The Windows Communication application is published by hkdb, and version 0.3.3 is open-source.

It handles multiple accounts through generic IMAP and SMTP, as well as Gmail, Microsoft 365 and Outlook, Yahoo, iCloud Mail, and GMX Mail. Proton Mail works through Proton Bridge, while Fastmail, Zoho Mail, AOL Mail, and Mail.com are supported providers that have not yet been tested. A unified inbox combines messages from different accounts with color coding, conversation view groups related messages, and local or IMAP search helps locate mail across the connected sources.

The detachable WYSIWYG composer and matching signatures use the TipTap editor, while CardDAV, Google, and Microsoft contact synchronization supplies autocomplete entries. Aerion also offers basic removal of tracking elements from message content, notifications that can focus an email when selected, and synchronization that resumes when the system wakes from suspend. Dark mode, multiple color themes, full keyboard navigation, vim-style shortcuts, PGP, and S/MIME cover customization and message handling preferences.

It suits people who want a compact email workspace for home or office correspondence, particularly when several providers must be monitored together. Its portable Windows design, low CPU, RAM, and battery use, and support for familiar mail protocols distinguish it from clients tied closely to broader desktop account infrastructure.