LabVIEW
cRIO Gxxx Module and SMTP E-Mail (non-SSL)
Aside from Hunters advise, I very much doubt that there is a publically open SMTP server available for you to use. Such a server would be in no time getting swamped with spam, and simply break down under the load of that, rendering it useless for any serious operation.
The only solution to avoid SSL would be to get somewhere an SMTP server that allows some form of basic authentification. This is generally not a very good idea since the authentification credentials are in fact transmitted almost in clear text over the network but it is the only solution that avoids SLL and still allows the server to operate without a lot of spam, until some of the authentification credentials have been compromised.
The best solution would be to simply encapsulate the entire TCP/IP stream into SSL and I have been working in the past on a TCP IP library replacement for LabVIEW with SSL encapsulation support but haven't gotten to a point where I could make any beta version available. Besides what I have been working on was for Windows and Linux only, although adaption to MacOS X and RT targets should be fairly straight forward once the code works
For desktop use I have in the past used stunnel to do the SSL part of the communication, and in theory, recompiling stunnel for cRIO shouldn't be that a big problem. But of course reality is always a bit more complicated than theory, especially since stunnel is only a small part of the work. Recompiling OpenSSL for cRIO is a much bigger challange I would guess.
Rolf Kalbermatter
