This was completely obvious.

Yeah, maybe something like that. I switched to Posteo (from Proton, which didn’t have IMAP back then, and that from Gmail) like a decade ago. And something that I appreciate about it is that I’ve developed a practice/ habit of archiving or deleting old emails.

I save important photos, documents etc to my local disk and then delete the email. For context, I have 70 messages in my inbox.

Like I said above, the way I think about it is they don’t want the cost of guaranteeing additional storage, but it’s just a guess. If you were to send them an email and ask (I’ve sent a couple over the years, they respond to email), I’d be curious what their public response is.

Does Posteo do a bunch of stuff that warrants a high rate for the higher end compared to the very affordable low end?

Posteo offers IMAP, CalDav, and CardDav. (Those were the features which sold me.) I think Tuta, and Proton don’t offer IMAP and none of them offer any WebDAV.

But does that relate to their storage pricing? Hard to say. Usually when I see things that are priced higher than what appears to be market rate, I understand that to mean the service provider doesn’t really want to do the thing. (Guaranteeing the availability of lots of GBs of storage for many users)

RMS! RMS! RMS!

GNU ! GNU! GNU!