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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.
It says that MailEnable Standard that comes with Plesk Windows will not work and you need an IMAP capable e-mail server.
What I was after however, is where to find the "sent items" folder in Plesk Linux. I cannot find it, and I presume it's also something to do with IMAP.
Windows Mailenable standard does include IMAP support
There is some other reason HORDE is not creating the sent mail folder by default (under the mail enable post office folder for the email account).
Atmail does work fine and sent mail folders are created when atmail is enabled instead of horde.
EDIT: I found the solution, on the login page of HORDE webmail the first option SERVER is either POP3 OR IMAP (you must manually choose IMAP and then login to see sent mail etc).