Basically what I said. Dovecot can be installed on every Linux or BSD system. You'll need Pideonhole and FTS Flatcurve as extensions.
When you install fetchmail, you can let it connect to all your IMAP or POP3 servers. Each process will deliver your mail instantly to your own Dovecot server.
You'll also need a certificate for Dovecot. This can be solved using Letsencrypt.
You can use any mail client you want. I use Fairemail on Android. On desktop and notebooks it's Thunderbird.
I sync my emails using a Dovecot IMAP server on my home server. I fetch emails from all my accounts with fetchmail and sort them into the right folders using Sieve. They get indexed and are searchable (ultra fast!).
Putin is scared of NATO. The surrounding countries joining the organization limit Russian power. It's possible to cut Russia off from many strategic routes, when encircled.
From his viewpoint, he must destroy Ukraine totally, with all its people. The probability of joining NATO is too high.
If they cannot manage their own infrastructure, they also don't know what infrastructure is needed for their services. And they won't even have the opportunity to learn anymore.
Secondly, if you buy external services, you need to consider improving connectivity.
I mean, you can still work on your on-premises servers, if your internet connection fails. You cannot, if you outsourced essentials parts.
My theory is that not all people are hardliners. They are misrepresented for the opposing propaganda. It's always exciting to present the other side with full outrage.
I personally think that outrage is evil. It polarizes and is not based on facts, but emotions. People who produce and publish outrage want to destroy the country and its society.
That's why you won't see much of the things you're worried about. You'll only see tendencies, because there're really a few hardliners somewhere.
Please be careful with two different things. Complex numbers have two components. Distances don't. They are scalars. The length of the vector (0,1) is also 1. Just as a+bi will have the length sqrt(a^2 + b^2). You can also use polar coordinates for complex numbers. This way, you can see that i has length 1, which is the distance from 0.
The triangle in the example above adds a vector and a scalar value. You can only add two vectors: (1,0) + (0,1) which results in (1,1) with the proper length. Or you can calculate the length/distance (absolute values) of the complex numbers directly.
This is an old PC (Intel i7 3770K) with 2 HDDs (16 TB) attached to onboard SATA3 controller, 16 GB RAM and 1 SSD (120 GB). Nothing special. And it's quite busy because it's my home server with a VM and containers.
Basically what I said. Dovecot can be installed on every Linux or BSD system. You'll need Pideonhole and FTS Flatcurve as extensions.
When you install fetchmail, you can let it connect to all your IMAP or POP3 servers. Each process will deliver your mail instantly to your own Dovecot server.
You'll also need a certificate for Dovecot. This can be solved using Letsencrypt.
You can use any mail client you want. I use Fairemail on Android. On desktop and notebooks it's Thunderbird.