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The APS Catalog has been deprecated and removed from all Plesk Obsidian versions. Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.
After a few more hours I stumbled upon a solution: Disable Permanent SEO-safe 301 redirect from HTTP to HTTPS in your main domain (the one which happens to be used as my plesk server domain). Once you do that, mailman won't be redirected to HTTPS anymore and the error is fixed.
You can then...
I've got a strange issue with mailman ("Mailing Lists") on the latest Plesk Onyx on Debian 8 with installed Let's Encrypt Plugin.
If I enable "Mailing Lists" on any of my secondary domains and I try to reach http://lists.mydomain.com/cgi-bin/mailman I get redirected to its https counterpart but...