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  • Outlook this certificate has expired or is not yet valid

Hi there,

I was just wondering why I am getting this error “This certificate has expired or is not yet valid” in Outlook and Thunderbird.
My mailcow runs smoothly and I am using a reverse proxy nginx. I use a certificate from letsencrypt.

Why am I getting this error every time I am receiving or sending email in outlook or thunderbird?

I would really appreciate your help.

THX

Kiwi88

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