Sneak through their filters then

I had the same problem. *All* of my legitimate personal mail to hotmail accounts was being dropped. Apart from any replies to messages I was doing. Hotmail wouldn't tell me why. So I configured my mail server to add the following spoofed headers to any message going to hotmail that doesn't already have the headers:

References: <BAY000-000000000000000000000000000@phx.gbl>

In-Reply-To: <BAY000-000000000000000000000000000@phx.gbl>

Success. Now hotmail considers my email considerably less spammy and lets it practically all through. If you pad the headers with something like 50KB of nonsense as well, they consider your message much less spammy. Such as vast quantities of these headers:

X-Hotmail-Fodder: 0000000000000000000000000000000000000000000000000000000000000000000000000000000000

Exim users see: http://exim.org/mail-archives/exim-users/Week-of-Mon-20070611/msg00130.html for a solution