Question
It is possible to control DKIM key length in Plesk?
Answer
Starting from Plesk Obsidian 18.0.55, Plesk installs 2048-bit keys by default, and no selection is available.
To switch back to 1024-bit DKIM keys, as a Plesk administrator, add the following lines to the panel.ini file:
[mail]
dkimKeySize = 1024