Installing Let's Encrypt with Zimbra 8.8.15 failed


I'm trying to install Let's encrypt for Zimbra mail server. I have downloaded Let's encrypt to the server. But when I run the command ./letsencrypt-auto certonly --standalone, I get an error.
-bash: ./letsencrypt-auto: No such file or directory

How do I do? Please guide me. Thanks.

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letsencrypt-auto isn't a thing anymore, you possibly followed an outdated tutorial. You probably want certbot:


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