stunnel3 stunnel [-c | -T] [-D [facility.]level] [-O a|l|r:option=value[:value]] [-o file] [-C cipherlist] [-p pemfile] [-v level] [-A certfile] [-S sources] [-a

Thanks to HBruijn for pointing me in the right direction. I ended up doing the following, extracted from my config: [mail2-smtp] protocol = smtp accept = 25 connect = localhost:26 [mail2-smtps] accept = 465 connect = localhost:26 [mail2-smtp-submission] protocol = smtp accept = 587 connect = localhost:26 [mail2-smtp-ssl-client] protocol = smtp accept = 26 client = yes connect = :587 Mar 29, 2019 · Overview. We all know how awesome stunnel is, but setting it up properly on Ubuntu (and on most other distros, really), can be a little tricky.. This post is dedicated to show you how to properly install and configure this magnificent piece of software on Ubuntu. Using Stunnel. Stunnel is a free SSL proxy server that provides SSL services to Windows programs. Stunnel is easy to install, very robust, and functions transparently with very little overhead. The stunnel program is designed to work as SSL encryption wrapper between remote clients and local (inetd-startable) or remote servers.The concept is that having non-SSL aware daemons running on your system you can easily set them up to communicate with clients over secure SSL channels. stunnel3 stunnel [-c | -T] [-D [facility.]level] [-O a|l|r:option=value[:value]] [-o file] [-C cipherlist] [-p pemfile] [-v level] [-A certfile] [-S sources] [-a I second this. sTunnel is quite useful to disguise an SSH/VPN connection as a normal HTTPS connection, which most ISP/firewall will not reject since it will disrupt almost all users way too much. sTunnel is open source under GPL, so could someone please make it portable?

That’s it! You should be able to send mail to anyone now. Stunnel is a great tool. It just listens on port 25. When it hears something, it adds the appropriate data around your un-encrypted email and sends it on to the mail server and port you specified in the conf file.

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Download the stunnel installer from www.stunnel.org; Run the installer or extract the files from into a folder using a tool such as 7zip on the Eggplant Functional system. Also install or copy the stunnel files onto the SUT (or you can use a shared network folder). The installation folder will contain an example stunnel.conf file.

The stunnel program is designed to work as SSL encryption wrapper between remote client and local (inetd-startable) or remote server. The concept is that having non-SSL aware dae- mons running on your system you can easily setup them to communicate with clients over secure SSL channel.