The following command runs a battery of tests against a Mail::Toaster:
toaster_setup.pl -s test
Its output is quite verbose. If you just want to make sure everything installed and is running correctly, you might want to pipe its output through grep and look for any "FAILED" lines.
toaster_setup.pl -s test | grep FAILED
If you have any, then you'll need to pay some attention to that area.
Visit the Mail::Toaster Configuration pages.