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I ran into some issues with the postfix container not being able to send emails, but it turned out I just needed to ask my VPS provider to unblock port 25 for SMTP.
I host it on a VPS since I was hesitant about having something like this hosted at home. As far as spinning it up, it was relatively straightforward using the docker instructions (https://join-lemmy.org/docs/administration/install_docker.html).
I ran into some issues with the postfix container not being able to send emails, but it turned out I just needed to ask my VPS provider to unblock port 25 for SMTP.
I started mine at home but quickly came to the same decision as you and moved it out to a VPS.
I use Amazon SES for mail relay.
Thank you for the link. I may try hosting it at home just for kicks.