First, I assume you’re talking about Mandril paid addon. If it’s so, I see you’ve added TXT record and that’s propagating. If not, would you share more details on it?
Yes, i do mean Mandrill paid addon. So this is what happened.
We used to run DNS, etc through Nexcess (our server host) We did have issues where mails went to spam on these 2 domains we have problems with. Recently we moved it to Cloudflare for better protection. And now Magento is not sending order confirmations at all.DKIM, SPF and Dmarc is all setup correctly in Cloudflare and Nexcess. I do not use proxy in Cloudflare.