functions with: char & type of parameters

I am trying to call following C function from Windows DLL from Python 
with ctypes.

int  __stdcall BBBOUNCECHECK(   char &strMessage,
                                 char &strAddressOut,
                                 int &lAddressLenOut,
                                 char &strEmailIgnoreList,
                                 char &strKey
                             );

I tried the following:
         pEmailAddress = create_string_buffer(255)
         emailAddressLength = c_long(0)
         returnValue = self.bBounceDLL.BBBOUNCECHECK(emailMessage, 
pEmailAddress, byref(emailAddressLength), self.excludeList, 
self.licenseKey);
         self.emailAddress = repr(pEmailAddress.value)
         return returnValue

But it looks like it does not work. It returns completely different 
results in comparison if I call the same DLL function from .NET C#.
It looks like there is a problem with: char & function type parameters. 
In all examples on Internet I see that for ctypes to call DLL function 
is there used mostly char *.

Could somebody advice, how to correctly call functions with: char & type 
of parameters, with ctypes from python? I do not see it in ctypes 
documentation at all.

Pavel

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