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I recommend using a more narrow pattern like "*.smtp-out.amazonses.com", though.

Doesn't that allow every host to connect? (And what happened to using the socket /var/run/mysqld/mysqld.sock only, not using TCP/IP connections at all?)

Because it's not necessary when it's the same name. In the maillog I find the mentioned complaint about SNI, so that means SNI was used, right? Have you looked into the maillog? Should there be no message like above, I guess plesk only configures SNI for domains that differ from the default...

By the way, the SNI configuration is broken, resulting in postfix/smtpd[1611847]: TLS SNI server.com from client.de not matched, using default chain every time SNI is used. It still works because the default chain is the one for server.com, verified with openssl s_client -connect server.com:465...

Then your user has a shell that is not bash. You could change that with chsh or by editing /etc/passwd directly, but running another shell might break scripts or cronjobs that rely on the shell being whatever it is now, so be sure to test.

You should contact IONOS and ask if there's anything in the logs of the host your VPS runs on.

Not much, save for bugs. But for a container, the host should have same or newer kernel version than the guest, otherwise there could be required features missing. So with an up-to-date host, you have a better chance of a guest upgrade succeeding.

Because MUAs default to using subdomains for well-known services.

That's the system-wide log. You obviously have /var/log/apache2/error.log. However, this will only show errors that aren't associated with a vhost. Those logs are in /var/www/vhosts/system/<domain>/logs.

That means you set rDNS wrong. Change to vps.i-web.nl.

How did you set that up? You do have two separate wordpress installations, right? I don't think multisite is supported by plesk yet.

Use smartctl -a /dev/nvme1 or nvme smart-log /dev/nvme1 etc. on the devices and compare the power_on_hours, that should tell you which ones were recently installed :) (if neither is installed, install smartmontools or nvme-cli) When you know the new ones, you can build the new raid. Well, there...

Are your queries really using the nameserver, or do you have leftover entries in /etc/hosts?

So you got two new devices nvme1 and nvme2? Next time you have to set up a server, I recommend you use lvm on top of the raid and then create the volumes within lvm. In such a setup, you can simply extend the lvm volume group adding more devices and then grow the individual volumes and filesystems.

That would not be a problem if apache only listened via loopback when nginx is reverse proxy. Just saying.

Somehow you seem to have qmail now instead?

Which version of proxmox do you have? proxmox 7+ is actually based on debian 11, so it is a lot closer to ubuntu 20 or 22 than to 18. Updates within a release should be fine either way.

The thing is, Redis and memcache require application support to be useful, while with varnish you'd rather have to take care of not caching things that should be dynamic. Like setting the browser caching parameters.

First try with other software that doesn't hide the actual problem. Second, email sending limits are for sending mail from the server. Using Outlook on port 465, you are trying to send mail to the server. Different direction, different filter.

Have you tried reordering the entries in /etc/passwd? It should use the first match for a uid ...