Manual @ PIPNI - Mail - How can I get rid of the "certificate is unreliable" message while accessing to the mailbox via encrypted protocols POP3S or SMTPS?

FAQ

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How can I get rid of the "certificate is unreliable" message while accessing to the mailbox via encrypted protocols POP3S or SMTPS?
Just browse to the site https://pipni.cz/, select the "view certificate" and "install certificate" options in the security warning dialog.
Afterwards, alter the POP3S and SMTPS server settings to mail.pipni.cz (free hosting) or mail2.pipni.cz (paid hosting; machines <www10) or mail4.pipni.cz (paid hosting; machines >=www10) respectively.
Note: How do I learn about the machine I'm on?.

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