This could be a country-based issue (he's in Barcelona), but I've been self-hosting email and web servers since 2011 across three states in the US, and I've only had one undelivered email, and it was a misconfiguration on the far side.

Get a business connection!  Yes, it costs more (about double, I pay like $250 for gigabit symmetric, and a stupid VOIP phone, which I'm sure I'll soon learn from you fine people how to host myself).  But you get at least one static IP, same-day customer service, and there's no bandwidth caps. 

Not to mention, no one is going to yeet everything into the sun from a business block of IP space, and if they do, think of all the other businesses and their lawyers.

I realize that there are some for whom this is impossible (rural, your awful crypto-bro Musky Starlink, etc), but the tone of "ok, no one can have email anymore" is just a bad and honestly counterproductive-to-your-mission take.

While I'm on counterproductive, I have to say you may have unintentionally (or not) created yourselves a nice little walled garden here with your No Agenda-style support model.  Why do I need a new language (boosts/sats, yes I know what they are after clicking around for an hour), a goddamn app and a bitcoin wallet to donate to you?  Incorporate yourselves somewhere (Ireland comes to mind) and take all payments.  Or provide a mailing address for people to send you money how THEY want to do it.  I don't want any more of ME traversing the internet than is absolutely necessary.  Give me something to do here, or I'm giving it all to Joe Ressington.  :)

Completing the compliment sandwich, I have, for lack of time to change it all out, been an unRAID user (186TB and counting!) for twelve years.  The amount of assistance Alex has provided me and so many others has been invaluable, so thank you.

Sue