A completely free, open-source client from the makers of Firefox. Thunderbird supports IMAP and POP3, allowing you to maintain a full local copy of your emails on Windows, Mac, or Linux. Canary Mail
Mailbird uses a local-first architecture that downloads complete email archives to your computer. It is significantly more memory-efficient than Outlook and offers near-instant local search results. Mozilla Thunderbird apps to download email
A user-friendly desktop application that supports downloading emails from Google Workspace , Office 365 , and IMAP servers into over 17 different formats. A completely free, open-source client from the makers
The desktop version of Outlook provides robust offline caching for professional environments, though it often requires manual configuration to ensure complete folders are downloaded for offline use. Specialized Email Download & Backup Tools It is significantly more memory-efficient than Outlook and
Offline-first email clients are specifically designed to download and index your entire message history onto your hard drive, ensuring you can read, search, and draft replies without an internet connection.