Γεια σου Ιάκοβε
Putting an ε in the end of all words indiscriminately is grammatically and phonetically wrong.
There are specific cases when we have to put an ε in the end of a word.
Maybe in some areas in Greece the final ε is put more often in oral speech due to idiomatic use.
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.