ERR failed mailed to fetch eml - problem with pop3

On Friday, I stopped downloading the mail program from o2.pl mail server. After refreshing, a message pops up: “ERR failed mailed to fetch eml”. Sending messages is done correctly…

Configuration changes, reinstallation of the program and removing accounts did not help to solve the problem.

I will add that “gmail.com” downloads messages without any problem.

Question, how to solve this problem? On the second computer I have the same problem with an email based on the o2.pl server

I attach photos.

Yours sincerely,
Kamil

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