What do you mean by local emails? You mean running your own SMTP server? That is very difficult to do in a way that will actually result in emails being received to inboxes. Email is largely a captured protocol, and it is no longer feasible to run your own SMTP server and expect clients to permit emails from that server. We plan to offer Mail In a Box at some point, but it will probably only work for certain use cases. Meaning, many people will not receive the emails you send them.
I remember a time I used to download all the emails locally and they would be deleted from the server. When there were no cell phones. I think it still possible if I use thunderbird or some client.
The thing is, it would be nice to have it downloaded to my Start9 and somehow be reachable from my phone using tor. Not sure if there’s something like this but it seems reasonable to me this could exist.