Re:Slack’s new WYSIWYG input box is terrible
by Biganon on Thursday November 21, 2019 @10:59AM
(#21595460)
They certainly DON'T interoperate. I have a mail-tester score of 100, use SPF, DKIM and DMARC, yet Microsoft still sends all my emails in the spam folder. There's nothing I can do about it, it's a black box. The only suggestion from them is that I subscribe to some paid program with another company in order to maybe, or maybe not, increase the trust in my mail server.
You can use paid services, or not. It's up to you, but they all interoperate.