Happens to me as well - Amazon's service mails are marked straight as spam. Even...

nervechannel · on Jan 26, 2011

If you're also on gmail, you can manually set up a filter to 'never send to spam'.

I've had to do this for friends' emails before, e.g. someone whose domain has a letter->number substitution which sets off spammer alarms.

pinko · on Jan 26, 2011

For some reason I object to this on principle, even though it clearly is a good idea. I want GMail to learn dammit, and do The Right Thing.