Skwotmail hosts our email server. No lists are handled there, but redirections to lists happen here. So only email accounts and aliases lie on skwotmail.
Lists are hosted at puscii. See sympa.
Specs
- OS: Ubuntu 16.04
- Mail system: Zimbra.
Special settings
I can't remember why, but I did
zimbra:~$ zmlocalconfig -e postfix_smtp_tls_security_level=may
See https://www.postfix.org/postconf.5.html#smtp_tls_security_level