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XCCDF
Guide to the Secure Configuration of Ubuntu 18.04
Services
IMAP and POP3 Server
Configure Dovecot if Necessary
Enable SSL Support
Enable SSL Support
An XCCDF Group - A logical subset of the XCCDF Benchmark
Details
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Enable SSL Support
SSL should be used to encrypt network traffic between the Dovecot server and its clients. Users must authenticate to the Dovecot server in order to read their mail, and passwords should never be transmitted in clear text. In addition, protecting mail as it is downloaded is a privacy measure, and clients may use SSL certificates to authenticate the server, preventing another system from impersonating the server.