Migrate some of our Schleuder lists to lizard

Originally created by @intrigeri on #16218 (Redmine)

And then:

• add monitoring of the MTA
• -document on https://tails.boum.org/contribute/working_together/roles/sysadmins/- (tails/tails#16254)

Parent Task: tails/sysadmin#16121

Subtasks

• tails/sysadmin#16253
• #16263 (closed)
• #16270 (closed)

Related issues

• Related to #16267 (closed)