Thanks for the info. We can see the reasons this got marked this as spam. Let's try and de-FUD.

It seems most of this is not n900's fault.

The major contributor is the FORGED_HOTMAIL_RCVD (score 2.55) category,. This seems to be a known, old problem with spamassassin, see, for example: http://www.directadmin.com/forum/showthread.php?t=18572 (I'm not conversant with spamassassin, but perhaps the version doing the scoring here is quite old? The link above is from 2007!)

In any case, it's nothing to do with the N900, it just means spamassassin failed to realise the hotmail hostnames in the Received: headers are genuine.

MISSING_SUBJECT: 1.816: The email Subject: header has no content. This is just a user error. Put the subject in! It's basic email common sense. Dumb threaded clients used by your recipients will lump your emails together with all kinds of nonsense if you don't.

NO_REAL_NAME: 0.961 : Just means that there is no real name in the From: header. i.e. it's like 'From: user@host.domain.com', rather than 'From: "Joe User" <user@host.domain.com>'. If there's a place in modest to configure your real name, you would presumably avoid this score (see: http://wiki.apache.org/spamassassin/Rules/NO_REAL_NAME). Avoidable by configuring a real name

Fixing any of the above would avoid getting junked. The three items together account for well over half the negative score.

The remaining categories:

HTML_TITLE_EMPTY: 0.214,
MISSING_MIMEOLE: 1.612,

Do seem to be things that modest could maybe avoid by doing html mail better. I don't really know much about these.

Disclaimer: I admit I haven't used modest at all (I use gmail via the browser, which works well enough for me )