Hello, Debian 4.9.168-1+deb9u4 (2019-07-19) x86_64 ISPConfig Version: 3.1.14p2 single Nginx I am migrating the mail from my old ISPConfig server to the new one. I encounter two major difficulties of setting. 1. The incoming imap server does not use encryption. How to specify STARTTTLS encryption in ISPConfig? 2. To handle spam, I use ManageSieve on the principle that everything is denied except email addresses and authorized message titles. On the new server, I can not add new filters from Roundcube. I can write it by hand on the .sieve file of the e-mail address on server. How to set [and where?] Email to accept very large numbers of filters?