PlanetsCentral

OK, I finally added a SPF record, I hope this didn't break anything.
I also changed the mails to use "https" instead of "http"
I wonder what exactly I authorize by adding that Postmaster Tools entry?

Thanks Stefan!

This morning's turns showed up nicely, and for the first time in years didn't get autoflagged as "not-important". Thank you for the change to HTTPS as well, that's virtually essential these days.

Authentication-Results: mx.google.com; spf=pass (google.com: domain of admin@planetscentral.com designates 85.214.218.199 as permitted sender) smtp.mailfrom=admin@planetscentral.com
Received-SPF: pass (google.com: domain of admin@planetscentral.com designates 85.214.218.199 as permitted sender) client-ip=85.214.218.199;

The main purpose of the Google DNS entry is to authenticate your Google account to the domain so that you can track email delivery reports using Google Postmaster Tools. It's not terribly useful for ultra-low volume mailers, it's more designed for tracking how thousands+ of Gmail recipients are receiving your emails, but if it adds a (tiny) benefit to the deliverability to Gmail recipients it seems worthwhile for me.