Test SMTP Error 550 The host name specified in HELO does not match IP address.

[gumpon]

Warning: mail() [function.mail]: SMTP server response: 550 The host name specified in HELO does not match IP address. in D:\webmail\installer\test.php on line 226
SMTP send:  NOT OK(Mail delivery with mail() failed. Check your error logs for details)

help me.... please