[PHP] mail function problem

[Emiliano Marmonti]

Dears:

    I have a problem using mail function under the default IIS's SMTP. Appears an 
error, something like:

    Unknown error in line 3

   Line 3 only have the instruction mail ("[EMAIL PROTECTED]","[TEST] Hola","Mensaje 
de Prueba"). 

I have tested the use of this function using another SMTP server (shareware) and works 
OK. I have tried to echo what is returning the instruction, and no returns, only the 
error message. Anybody knows what could be happening?

Thanks in advance
Emiliano Marmonti