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wót ASTbooks dnja Julij 29, 2021 · trajny wótkaz

Hello, i don't know if here is the correct place to write my question.

I'm Nikolaos from Greece.
I would like to export my mails to csv with this add-ons but when i open the file, i see some strange symbols and not the Greek language. When i export them as pdf or a simple txt, they are right.

Why does it happens?Please could you help me to find a solution?

Thank you very much