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'Stunnel' works as an SSL encryption wrapper between a remote client and a local (inetd-startable) or remote server. It adds SSL functionality to commonly used inetd daemons like POP2, POP3, and IMAP servers without any changes in the programs' code. It will negotiate an SSL connection using the OpenSSL or SSLeay libraries. It calls the underlying crypto libraries, so stunnel supports whatever cryptographic algorithms you compiled into your crypto package.


See for a complete list of documentation


Download version 4.11 (stable)
released on 9 July 2005

Paid technical support available from


Related Projects


LicenseVerified byVerified onNotes
GPLv2 with exceptionJanet Casey29 July 2002

Leaders and contributors

Pawel Krawczyk Contributor
Michal Trojnara Maintainer
Adam Hernik Contributor
Brian Hatch Contributor
Dirk O. Siebnich Contributor

Resources and communication

Audience Resource type URI
Help E-mail
Support E-mail

Software prerequisites

Kind Description
Weak prerequisite tcp wrappers
Required to build OpenSSL

This entry (in part or in whole) was last reviewed on 11 July 2005.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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