Those are API things. Should be an API, build an MCP server for it. Doesn't touch the PC. About the automated responses, that's a write operation, therefore requires user consent.

If you want to design a system specifically to make sure you're not going to get stonewalled for sending me an emdash, you build and maintain a set of permissive rules for sending/reading to avoid my blacklist of people I'll never work with.

Once you got API stuff sorted, just throw a cronjob at it or build a service for that stuff.

^ There be prompts all over the place here, obviously. Realistically your MCP server will end up hacking on POP3.