Fair enough. I could be happy to purchase if given more/better options. In fact, having the ability to do business from different platforms or self host is smart. Not having all your eggs in one basket is preferable. I was speaking more to people/businesses that rely on Facebook as their singular point of business. And my pet peeve that frustrates to the maximum is business support solely on X/Twit - That is so low effort and unprofessional.

Last time I looked it didn’t -https://posteo.de/en/site/faq. However, Tuta does - https://tuta.com/blog/posts/own-domain-email. To refocus on OP’s question, I would be happy to get a “professional business email” from a Posteo address.

Posteo is great for business. It’s a professional and competent company that respects your privacy to a good degree, and has a clue about security. In a sense it’s MORE professional than trying to DIY, unless you really know what you’re doing. I would feel encouraged to see a business use Posteo when I receive the email. It tells me that your business probably cares a little about security and/or privacy and possibly the environment too. Total kudos for using Posteo from me.

What I think is completely unprofessional is to use your ISP’s address for business email. The number one unprofessional business move, in my opinion, is to have your business website on Facebook/Meta, Twitter or any other enshitified corporate social media site. You won’t get my business. I’ll go anywhere else no matter how inconvenient.

See, you educated yourself! I only wanted to point you to official documentation with the hope you get in the habit of starting there (with any tech). Ask a hundred people and probably get a hundred differing answers. Look at Stack Overflow and sites like that where there’s always multiple answers. Thankfully there’s usually one with a green tick that is likely the best answer. Anyway, you now have it in a nutshell - No data to recover = The point of using Tails (without persistence). There’s no such thing as permanent total online anonymity.

I think the first responder @grant did understand and answered in a relevant way. I’ll answer your question with a question. What is the point of using VPN if your ISP can correlate times from logs? I think you should get on the Tails site and educate yourself further to better understand use case for Tails.