Hi Dear Pleskians,
I am Julien and I'm new on this forum. Nice to meet you all ! :)
For starters, I'm running Plesk Onyx Version 17.8.11 Update #84 on a Debian 9.12 Server. I use the inner Plesk DNS System. My Postfix version is 3.14.
Now, for some reason, some of my clients need to have a...