You might want to review what it is about the emails you send that sometimes snares them. I note that the email address you have for me is perfectly good, but I missed or didn't receive a renewal notice and also any emails that should have been sent as a result of subscribing to this thread. I personally triage emails in my spam pile by looking for either a familiar sender or a meaningful subject, so an email from "FlyerTalk" with a subject of "FlyerTalk premium subscription expiring" would have certainly gotten my attention, while one from "FT" or "Subscription Department" with a more generic subject would have gone to its death.