Many email servers (e.g. gmail) won't even accept email from residential IPs. I have a janky setup where I proxy mail from my home network to my VPS and then send it from there (outbound-only, and only to myself - for notices like "backup started", "backup finished" etc)

Cloudron also has a full email stack ready to go, however you are totally right about the residential IPs. They are basically all blacklisted by default, which is also why we had to add easy relay-provider support.

> They are basically all blacklisted by default, which is also why we had to add easy relay-provider support.

While I understand why people are doing this, I believe it's not the right way to deal with the problem - basically we're handing over e-mail (as a service) to a few big corps. Each time I have this problem I go through the long and painstaking process of whitelisting the IP and fight to make it work. Usually having it work with Gmail, Yahoo and Microsoft is enough - many smaller orgs don't use balcklisting by default because they have enough problems with mail deliverability already.

While in principle I agree, the reality is that spam is a real problem.

At least we have a decent amount of competition and choice in the email provider space.