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Twilio provides APIs and tools for SMS, voice, email, and customer engagement.

OpenPGP mail hosting with aliases and IMAP support

Browser-created aliases with recipient routing and reply support

KDE mail with OpenPGP, S/MIME and contact-based crypto preferences

A terminal mail client with GPG signing and encryption

Email-client tracker controls with PGP and S/MIME options

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 terminal mail client with PGP/MIME and extensive configuration

A Mutt-derived terminal client with documented encryption configuration

B2B email campaigns with scheduled and event-triggered follow-up