I want to use let's encrypt on a mail server

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. https://crt.sh/?q=example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: mail.gamesyap.com

I ran this command: certbot-auto certonly -d mail.gamesyap.com

It produced this output: I don’t have error

My web server is (include version): nginx 1.14

The operating system my web server runs on is (include version): Ubuntu 18.04

My hosting provider, if applicable, is: linode.com

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no
I am trying use the certificate mail.gamesyap.com for my postfix and dovecot server but I have error use email account on the thunderbird with the information no validate how can I use let’s encrypt for postfix and dovecot?

What’s your question? It sounds like you were able to successfully generate a certificate. Do you need to know how to tell your mail server to use a certificate? That depends on the mail server, and you’d probably have better luck looking up the documentation for the mail server you’re using. We can try to help if you run into issues, but unless you’re using a common mail server with which some people here are familiar, you might consider asking at a community forum for that mail server.

You may find better results faster using a search engine.
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