I found a bug in check.php (1.1.0a2) and need some fix.
which is
$result = email_send( config_get_global( 'administrator_email' ), 'Testing PHP mail() function', 'Your PHP mail settings appear to be correctly set.');
it shound cannot work properly on 1.1.0a2
and I did the following modify to fix it.
$t_email_data = new EmailData;
$t_email_data->email = config_get_global( 'administrator_email' );
$t_email_data->subject = 'Testing PHP mail() function';
$t_email_data->body = 'Your PHP mail settings appear to be correctly set.';
$result = email_send($t_email_data);
for your reference
A Test E-mail bug of check.php (1.1.0a2)
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