Miltr Common

Single source of truth for miltr-server and miltr-client implementations.

The milter protocol basically works as follows:

1. A client establishes a connection to a server, negotiating Options via both sending [optneg::OptNeg] packages.
2. The client send a [commands::Command] for each SMTP command it receives
3. The server responds to each of those commands with an [actions::Action]
4. After [commands::EndOfBody] the server responds with a list of [modifications::ModificationAction] to instruct the client what to change in the processed mail.

This is what's contained within the [actions], [commands], [modifications] and [optneg] module.

As all packages share some logic on how to be (de-)serialized, modules [encoding] and [decoding] contain the implementation of that.

All parsing is based on splitting [bytes::BytesMut] into smaller parts.