A cross-platform .NET library for IMAP, POP3, and SMTP.

A .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.

Simple API, Complex Emails (Jakarta Mail smtp wrapper)

An S/MIME signing utility for use with Git

UNSUPPORTED Fork of OpenSSL 1.1.1 that includes prototype quantum-resistant algorithms and ciphersuites based on liboqs PLEASE SWITCH TO OQS-Provider for OpenSSL 3

en-crypt, de-crypt, si-gn, ve-rify - smime, pdf, xades and plain files in pure python

A C/C++ MIME creation and parser library with support for S/MIME, PGP, and Unix mbox spools.

.NET email library and proxy supporting IMAP, POP3, and SMTP with S/MIME and PGP.

ACME Email Client for EmailReply-00 Challenge

AS2 Library for building and parsing Messages and MDNs

🔐 📧 Encrypts WordPress emails using OpenPGP or S/MIME with a familiar API.

A S/MIME library for JavaMail

API specification for gematik's KIM - a secure Email standard, which enables the exchange of information and payload in the German healthcare sector.

S/MIME encoder in pure python

Aegis Implicit Mail

PKI Consortium Community Discussions

a purly Peer-to-Peer instant messenger client

Openssl Nif wrapper for Elixir

Serialization of cryptographic data types

Great DANE Engine