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Hi.
I know that behavior and it works as designed . The parse error is what a spam bot would see, as in this case you simulate sending spam. If the message appears in your spam inbox but not at the point where they usually appear everything works as expected.
If you switch off the simulation mode, you should get meaningfull success messages again and the messages shell appear where they are intended to appear.
It is important to switch off that mode as soon as testing is done. As otherwise every incoming submission will be treated as spam.
If you need further help, we can have a call too.
Cheers, Matthias