Procmail for the old school win.

Yes.

Not tried the app version. Been using Fairemail for a while now, since k9 was unmaintained.

Fairemail is well maintained. Quick. Supports multiple accounts very well. Loads of features (could be a downside for those who like things simple). Designed with security and privacy as top priorities right from the start. Open source development. For a long time its been the best email client on Android IMHO.

I cut my teeth on an early version of The Linux Networking Howto, still available at tldp.org. That’s a little bit out of date now :-) but the basic IPv4 networking concepts are still good.

These days so much is implementation or distribution dependent. There has been so much very rapid development in this field during the internet era that the age of documentation matters significantly.

A mitigating, but also confusing, factor is that different generations of networking tools have backwards compatibility built in so that it has been possible to build firewalls on kernels running nftables using iptables utilities in userspace.

I think you could do worse than starting with the Debian wikis and then drilling down into other documentation for the specific distributions or applications you want to use.

I seem to remember that openwrt.org and shorewall.org (though that product is EOL) also have some good overarching network stuff. I think Hurricane Electric he.com may still do their free basic IPv6 certificate programme?

Wikipedia is also your friend in this, especially the references.

I’ve enjoyed onemarcfifty.com’s videos too, but that format isn’t what you are looking for, and the transcripts I have seen are not formatted.

I like this idea so much. The problem is quality control.

Uber Eats here in UK really struggles to delivery an accurate order. And where there is a problem the driver blames the restaurant, the restaurant blames the driver, and Uber or the restaurant (it’s frequently not clear where to begin) may or may not issue a refund and perhaps an apology, but that doesn’t solve the problem which is you don’t have the food you were promised and that you paid for. No one takes responsibility for that.

Who in a decentralised system can or should take responsibility?

Amazon, for all their many faults, claim to be trying to make the most customer-centric company on earth. A lot of their early success came from a stellar returns policy, shouldering responsibility for products they dispatched, as well as excellent prices. Not so much now, but certainly during their incredible retail growth period.

How do you code for that in a federated system? And, if you can, how do you compete in a wider marketplace with an Amazon monolith?

Oh wow! The Unexpected Keyboard is a very pleasant surprise!

My new default. Thanks for the recommendation!