I correct ed the issue with the file manager by commenting the webassist/kfm/themes/.htaccess file.
the issue wit hthe preview though is not something that i cvan fix.
the error being returned is:
SMTP server response: 550 Authentication is required for relay
this means that the sites SMTP Server requires authentication in order to connect. Power messenger uses the php mail() function which does not have support for connecting to SMTP server s that require authentication.
Most hosts offer a relay SMTP server that does not require authentication that can be used by web scripts, you will need to contact the host to determine if they offer a relay server that can be used.