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After the migration/restoring the backup the following warning is shown:
The component Spam Filter is not installed. It will be disabled for the following objects...
Plesk > Tools & Settings > Mail Server Settings > Spam filtering tab cannot be accessed and the following appeared:
Spam filter is not installed
SpamAssassin is not installed.
Install SpamAssassin in Plesk > Tools & Settings > Updates and Upgrades > Mail hosting features > Install SpamAssassin .