Hello, we're using MLF on one of our websites and seem to be getting the following error when trying to send private messages.

* No connection to the mail server - please try again later

I can't find anything about it on the forum so thought I'd post about it.

We are on Windows Server 2003 Enterprise x64 SP1
IIS 6
PHP Version 5.2.0
Internal Sendmail Support for Windows enabled

Could anyone give us an idea as to what we might be missing here?

Thanks in advance!!