if i change the squirremaill by another email client, as sugested here: https://www.howtoforge.com/changing-from-squirrelmail-to-roundcube-on-your-ispconfig3-server I can lose some of ispconfig features? or all of the properties, such as those related to spam, will continue to work?
Squirrelmail is not connected to ispconfig. You can use any web or other mail client with your ispconfig server, so exchanging the webmail client is no problem.
