I suspect that your ISAPI module isn't reading correct php.ini. You can verify this by looking on top of phpinfo() output page were the used php.ini file will be specified. I just tested mail() and it works correctly.

You could also try to specify the two ini parameters in the scripts itself:

ini_set('SMTP', 'mail.example.com');
ini_set('sendmail_from', 'test@example.com');
mail("test@example.com", "test", "test");

Eys thats correct, it dont use any php.ini
But that is here of course and with php.exe it will be used

I had it in the same directory as php.exe and php4isapi.dll
since php 4.3.0 this works perfectly and is no need to copy it to win dir - i copied php4isapi in the root path of the interpreter so i can use relative path to the extension dir with only extension_dir = extensions but now nothing of all them will work 

I ve tried also to copy php.ini in the windir but it dont work with isapi but phpinfo shows  extension_dir = c:\php4 and i dont know from where this value comes

maybe - my windows is installed on K:\ 
php is installed in k:\server\php

hope this small bug will alos fixed in next release when anybody found it

where have you php installed ?

What does "Configuration File (php.ini) Path" from phpinfo() show?

And please use "Edit Submition" and "Add Comment" for the bug report.

now i know why it is so
the php.exe uses a php.ini-file when it is in same directory also but with the isapi it must be in the windir

dont really know why this is different 

about the button 
sorry if i used the developer

OK. So I assume that this is not a bug in PHP.