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It depends on the relayhost and authentication. relay services "normally" have documentations "how to configure" their services with common mail - servers. Here is an example which can be adjusted for other relayhosts as well: How to set up Postfix to send emails using Gmail Relay with...

Well this should work out of the box for ip4 & ip6 or at least it does on my Servers There are several ways to do it, so you can try for example: Extension SSL-It -> there is an option to enable HSTS - How to enable HTTP Strict-Transport-Security (HSTS) for a domain on the Plesk server...

Plesk Obsidian Version 18.0.21 Update #5 postfix 3.4.5-v.ubuntu.16.04+p18.0.22.0+t191121.1820 OS: Ubuntu 16.04 is it possible to enable TLS 1.3 for postfix now and if yes how ?

you can try the plesk panel > Tools & Settings > Process list See also How to check which domain PHP process consumes CPU resources?

@learning_curve - do you use ipset within fail2ban? I had a working version under Onyx, but this works only partly under obsidian after upgrade from onyx. Only IPV4 adresses are stored and none IPV6. Edit: got it fixed had to update the iptables-ipset-proto6.conf - it seems this confs are not...

you can try to enable log-requests in panel.ini and see if it makes any difference Managing Let’s Encrypt Settings in the past under onyx I faced something simular and an reinstallation of the letsencrypt extension was the only way to solve it

Check your /var/log/plesk/panel.log file. The Let's encrypt renewal job log to that file if anything went wrong.

Hard to say, there are a lot of things which can do this. Looking at the top result, its totally faire as Linux works in such a way that it utilizes almost all memory for the overall performance, So which php versions do you use/have? Did you take into consider to switch from fastcgi to fmp? and...

well that's unfortunate, if nobody else has a good idea, all you can do is open a support ticket at Plesk.

You can take into consider to enable in plesk panel > Tools & settings> IP Address Banning (Fail2Ban). Fail2ban can handle "Bad Bots" when you use the plesk-apache-badbot jail. See: Fail2Ban Jails Management or if you have nginx in place take a look at Instruction - Blocking extra bots using nginx

just to be sure on the Plesk Panel > Tools & Settings > Mail Server Settings > Server-Wide Mail Settings > DKIM spam protection > Allow signing outgoing mail is enabled ?

How are you sending the mail to dkimvalidator.com via Client or webmail? is there something related to dkim or milter warnings in the servers maillog when sending a mail?

Maybe you are using a Customized Power User View which hide some features? see: Customizing Power User View It would be also helpfull when you provide some more details about your System and Plesk Version

Please check also: DKIM does not work: This message does not contain a DKIM Signature & How to check if DKIM is working on a domain

Well Obsidian is marked and available as GA since 22 October 2019 see also Change Log for Plesk Obsidian perhaps the availability depends on which Tier Level you have set on your system: Plesk Onyx Release Tiers Plesk Obsidian 18.0.21 Update 4 PHP Updates 3 December 2019 PHP version 7.4.0 is...

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it might help if you can tell some details about the update you did. Sometimes remove and install will help see: How to install/remove additional PHP versions provided by Plesk

ok did some tests, as long as I change the settings in the gui for the domain and apply the settings, the gui & domain.tld.conf will match / show same figures. If the domain.tld.conf was modified manualy it seems the gui does not read this settings back from it, perhaps plesk has it saved /...

First see How to rename a domain in Plesk well in your case I assume you have to rename it in 2 steps like Example.com -> example1.com and then example1.com -> example.com and never forget to backup before :)

usually (Centos & Ubuntu) the php.ini for the domains are located under: /opt/plesk/php/7.x/etc/php-fpm.d/ and there you will get / see the settings from the gui afaik a manual added php.ini under /var/www/vhosts/system/domain.tld/conf/php.ini will not be updated / changed by the gui settings