I know this isn’t about Digital Ocean hosting, but I am working in a test/dev environment before moving to hosting.
I have a locally hosted Ubutnu Server 20.04 LTS avaialble only to the intranet, for running BookStack. I have Postfix instlled and configured properly and sending both aliased and local email to myself for things like errors and unattended upgrades. That’s really all I need, so do I need to install an SSL via Certbot to secure the send only emaail functionality to a single address: mine?
I did use this tutorial to install Certbot to obtain an ssl, but the hostname of my machine does not include my domain name since this is locally hosted and not facing the web. However, I get an error that certbot could not validate the domain when I do enter the legitimate domain of the company I work for.
So… once again, do I need to encrypt the send only emails to my address for unattended updates and local mail to root, or can I leave it at the base setup? And if I do need to encrypt that traffic, I did verify port 80 is available through ufw, but do I also need 443 to validate the domain? Or am I doing this all wrong?
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