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.