Plus one for this! I use my GMail account simply for forum connections and such, business is handled by our own email server. This so my business email does not lay on numerous servers all over the world. It was actually due to spamming that this came about a few years ago.

Now however, I can't use the GMail for any legitimate business ... since nearly all my contacts see it as spam. At least on our own server, we've modified the rules to allow certain GMail accounts (and other free mail where we found out about it).

Another strange thing: one of my collogues uses his GMail from Cell Phone. If he sends using the Nokia's built-in email client - it always turns out to be spam. But if he sends using the GMail Java app, it works fine most of the time. So it seems even the email client could generate a spam flag, not just the server.