Dovecot and Letsencrypt R3 error

If your Dovecot just started telling your that the Letsencrypt R3 certificate expired, make sure you are using the fullchain certificate in your configuration file.

Make sure you have the following in your /etc/dovecot/conf.d/10-ssl.conf

ssl_cert = /etc/letsencrypt/live/mail.foo.com/fullchain.pem
ssl_key = /etc/letsencrypt/live/mail.foo.com/privkey.pem

And restart dovecot afterwards.

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