KMail
apps.kde.orgKDE mail with OpenPGP, S/MIME and contact-based crypto preferences
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KDE mail with OpenPGP, S/MIME and contact-based crypto preferences
Secure client messages and files through browser, Outlook or Gmail
Encrypted attachments and messages within Outlook and Gmail
Encrypted mail hosting with aliases and mailbox-import tools
A Mutt-derived terminal client with documented encryption configuration
Community mail hosting with clear guidance on encryption limits
Disposable forwarding addresses that keep a primary address separate
Personal antivirus with web and email threat controls
B2B email campaigns with scheduled and event-triggered follow-up