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 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.