How to delete mail from server after downloaded?

How to delete mail from server after downloaded?

Hi!
I´been using zoho mail for several months and noted that all of the mails I have downloaded since the begining
are still on the server...
My local client is mozilla thunderbird and I have set the option for deleting mails on server when they are more than 3 days
old. But it seems this doesnt work.
Could someone help me please to manage this ? 
Thanks in advance!
Gabriel.



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