Hello,
I have got a windows 2000 IIS 5.0 box. I used php mail. But now it gives error like this.

Warning: Unknown error in C:\........\phpmail.php

I check php.ini for smtp server but it is correct. I ama working for hours. I don't solve it. Can anyone suggest me a solution?

Thanks a lot

What makes you think it's a mail() problem?
If the script contains more coding then just mail(), that that can be the problem.