Email Client Download Guide: Manage All Your Inboxes in One Place

Most modern clients use IMAP, which keeps mail in sync across devices because messages stay on the server. POP3 downloads and often removes mail from the server, which suits a single-device setup but is rarely ideal today. Check that your client supports your provider's authentication, especially OAuth for Gmail and Microsoft 365, which now require it for security.

The headline feature for most people is a unified inbox that shows all accounts together while still letting you reply from the right address. Look for per-account signatures, color labels, and the ability to file or search across everything at once.

• Unified inbox across Gmail, Outlook, and custom domains.
• Per-account identities and signatures.
• Powerful search and filtering rules.

Thunderbird is the standout open-source client, free, cross-platform, and continually updated with calendar and chat built in. Commercial and freemium options like Mailspring and eM Client add a more modern interface and features like read receipts or unified contacts, sometimes behind a paid tier. Outlook remains the default in many workplaces and integrates tightly with Microsoft 365.

If confidentiality matters, look for clients that support PGP/GPG encryption (Thunderbird has it built in) or dedicated apps like the Proton Mail desktop bridge for encrypted accounts. Remember that encryption protects message contents, not the fact that you communicated, and both sender and recipient need compatible setups for end-to-end protection.

When adding accounts, prefer app passwords or OAuth over typing your main password, enable two-factor authentication on the underlying accounts, and keep the client updated. Download installers only from the vendor and scan them first. Be cautious of clients that ask to route your mail through their own servers, as that changes who can see your messages.