Stunnel, by Michał Trojnara, is a trusted open-source layer that adds SSL encryption to popular Windows 7 applications, such as POP3 or IMAP email clients. Users can enjoy top-notch encryption on their communication channels without having to pay for an SSL certificate, as Stunnel acts as an intermediate layer. Download Stunnel now and enjoy enhanced security without sacrificing speed or compatibility with your favorite Windows 7 apps.

Stunnel is a program that allows you to encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer) available on both Unix and Windows. Stunnel can allow you to secure non-SSL aware daemons and protocols (like POP, IMAP, LDAP, etc) by having Stunnel provide the encryption, requiring no changes to the daemon's code.

The Stunnel source code is not a complete product -- you still require a functioning SSL library such as OpenSSL or SSLeay in order to compile stunnel. This means that stunnel can support whatever (and only) that which your SSL library can, without making any changes in the Stunnel code.

The Stunnel source code is available under the GNU General Public License, meaning it is free to use in both commercial and non commercial applications as you see fit, as long as you provide source code (and any modifications) with the software. Your compiled Stunnel binary is 'restricted' by whatever license your chosen SSL library is under, however both OpenSSL and SSLeay are open source and similarly liberal in their licensing.

New Release
Bugfixes:
Fixed LibreSSL 4.3.2 build and client mode failures: the session cache callback now matches LibreSSL's const-qualified API, IP literal addresses are no longer sent in the SNI extension (where LibreSSL rejects them), and a warning is logged instead of silently skipping the memory allocator hook on LibreSSL.
Fixed LibreSSL 4.3.2 client-mode crash when the TLS server sends TLS 1.3 session tickets: LibreSSL calls the ex_data duplication callback even when the cached address was never set, unlike OpenSSL, which only calls it for existing values (thanks to Masahito Yamaga).
Re-enabled the "checkHost", "checkEmail", and "checkIP" options with LibreSSL, which has long supported the underlying X.509 name checking API (thanks to Masahito Yamaga).
[ Stunnel release history ]

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