Hotmail Mail problem...

[resellertr]

Hi,
I use plesk for windows 6.5.2 ( all patches applied ).
We can't get e-mail from hotmail, google.
We can send to hotmail, but we can't get e-mail from hotmail and google.
I searched smtp logs i find an error. But I don't know how to correct it...
354 Start mail input; end with <CRLF>.<CRLF>
What does it mean?
Note: There is no antispam software installed on mail server...