In order to make email delivery faster and more reliable, I've switched over to the Amazon SES service. This should make email less likely to be marked as spam, especially important for people registering and needing to confirm email addresses.
Of course it's always possible I've done something wrong, so if your were getting email notifications before, and it suddenly stops, or ends up in the spam folder, then please let me know.
Hey @Mick West I ran into this post while trying to figure out the best way to fix my email-to-spam problem. Can you possibly shed some light on how I can fix this? My site is going to start getting some traffic soon and all my registration/verification emails are getting spammed. Thanks.
So I've been running Mandrill for four days, and it's working wonderfully. Easy spf and dkim, proper return paths, and free for 12,000 emails per month. Should all be a lot more reliable than the previous system.