My ISP offers unauthenticated SMTP for their customer addresses. It’s pretty heavily rate limited, but well enough for the occasional status email my system throws out. At least around here they are pretty common for residential customers, so that might be an option.

Other possibility is to set up SMTP relay to your network and give it credentials to an actual email account (with SMTP support, which isn’t granted these days). It can take in emails from your network without credentials and throw them to the internet with your account. It’s pretty simple to set up, search for postfix + smarthost. Added bonus is that you can read the replies to that address too via your email provider services.

Search for O’Reilly books, the style is spot on with their covers.

OrgAbuseHandle: ABUSE9107-ARIN

OrgAbuseName: ABUSE

OrgAbusePhone: +1-313-516-8908

OrgAbuseEmail: abuse@hostodo.com

OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE9107-ARIN

They have options. No idea if they actually do anything for the reports, but it’s worth a shot.

I’m running Dahua cameras. They can pull new firmware straight over the internet, but they don’t rely on any cloud services. All kinds of flavours available and they do run on POE.

Don’t send spam, behave nicely, have proper configuration on postfix and dovecot, set up SPF and preferably DKIM, keep your domains reputation clean and so on. You’ll likely still end up on some lists, so you need to manually dig them trough and ask nicely for removal.

Self hosting email has a pretty bad reputation and many will strongly advice against it, but in reality it’s really not that bad. But email as a whole is more complex beast to manage than simple website or running Jellyfin for your family and friends. You need to understand how the mail routing side of things work (SMTP itself, authentication for it encryption included and so on) and also you need to understand how DNS works and how various entries are related to mail transport. Then you’ll likely want at least some kind of spam filtering and so on. And with email you’ll need to have proper backup scenario too so that you don’t lose the likely pretty important data. All of that is perfectly doable and it’s not as difficult as many claim it to be, but there’s a bunch of stuff you need to understand and implement all of them correctly.

There’s various permission errors on the log file, I’d start from those. Also your dovecot configs seem a bit funny to me, usually mails are not stored to user home directories with dovecot, but instead somewhere under /var, likely you’ll want /var/vmail. Logfiles are pretty good with these tools, so pay close attention to those.

And take your time to understand what the config options actually do. Too permissive configurations will get your sever to every spamlist on the world pretty quickly.