Hi,
This thread is about an issue sending email on Mono. I prefer if you are having some other email issue on another platform that you start a new thread instead of changing topics on this one. These are not the same questions. The first question is likely a Mono bug, your new question is surely a configuration issue.
Note that this setting has changed its default in the 2.3.1.0 release
<add key="DisableDotNetOpenMail" value="true" />
it used to be false so you might experiment with setting it to false.
If that fails to solve it please start a new thread and mention what mojoportal feature is not sending email, what your configuration looks like, and I would want to see more of the stack trace showing where in the mojoportal code this error happened.
Best,
Joe