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Sign nginx website and dovecot imap server on debian with let’s encrypt

If you have a setup with a single server with multiple services (web, IMAP etc.), and one CNAME per service (www.somedomain.com, imap.somedomain.com), and you would like to get the services signed in a manner that doesn’t give warnings or errors in browsers  (especially browsers in phones and tablets with iOS and Android), then this article may be of interest.

Self-signed certificates is a nuisance and the cacert.org initiative has been losing support. Let’s encrypt offers the possibility of having free (as in both cost and feedom) SSL certificates that don’t give warnings in web browsers. The only problem the threshold of taking the time to figure out how to use it.
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