Thank you for your input! We will consider this functionality in upcoming releases if it will be popular.
Everyone, please continue voting for this feature if you consider it important.
An error occurred while saving the commentMartin commented
I think this is a very good suggestion.
cPanel has it since years back.
plesk comes across as old fashioned and slow.
in cPanel you can manage this as an admin in the GUI.
The sieve for thunderbird is a very good idea.
I was not aware it excissted. Since it does make plesk on par with cPanel