2. MimekitA .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.
3. GmimeA C/C++ MIME creation and parser library with support for S/MIME, PGP, and Unix mbox spools.
4. MailkitA cross-platform .NET library for IMAP, POP3, and SMTP.