[Help]How to connect to a smtp server?

I’m changed it for security reason). I’m successfully test my parameters in standard libcurl example - mails arrived fine. but I can’t understand how to properly define variables instead “#define

when I’m using your code - problem in my header because I’m not understood how to properly define some variables in your example.

in source.zip above - I’m include header and cpp with your code.
If you take a glance - I’m very appreciate it :wink: