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    SoulrainS

    @PitaJ said in Error: unable to verify the first certificate. How to fix?:

    You may be able to fix this by changing your email server setup to provide a different certificate, one which embeds the full chain. (Probably fullchain.pem)

    Since postfix was working for every other site on the server, I never thought to try that. But I did and it worked! Thank you very much.