MailCleaner is a feature-rich, open source antispam solution. Its virtual appliances (VMs) available for distribution come out-of-the-box with self-signed certificates for both the web interface and the MTA services.
This requires you to supply your own valid, publicly trusted certificate. Using a Let's Encrypt certificate is a great way to accomplish that because it's free, safe, and automated.
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from Opensource.com https://ift.tt/2zdBXcx
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