Self-Hosted Alternatives to Popular Services

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The original was posted on /r/selfhosted by /u/pcnoob-codpro on 2023-07-03 13:36:24+00:00.

I am following this guide to make a raspberry pi mail server and so far everything has worked except for creating the mail folders (I am happy to come back to that later) and generating and ssl certificate. When I run the commands you suggested to run the script the script returns that the directory does not exist. I am just wondering if anyone has any ideas of what to do. I thought maybe creating the directory myself would work, but I am not sure if the script is expecting stuff to be in there :|