X-Git-Url: https://git.r.bdr.sh/rbdr/olden-mail/blobdiff_plain/768227f7aa31e2930e1ff2641c24fbf06fc339fe..refs/heads/main:/README.md

diff --git a/README.md b/README.md
index 6c580f7..c494ef5 100644
--- a/README.md
+++ b/README.md
@@ -35,32 +35,44 @@ The proxy requires you to set environment variables, but otherwise takes
 no options.
 
 * `LOCAL_IMAP_PORT` u16, the port in which the server will listen for
-IMAP clients. Defaults to 143.
+  IMAP clients. Defaults to 143.
 * `LOCAL_IMAP_BIND_ADDRESS` String, the address on which to listen for
-IMAP clients. Defaults to 0.0.0.0.
+  IMAP clients. Defaults to 0.0.0.0.
 * `REMOTE_IMAP_PORT` u16, the port to which the server will forward the
-IMAP messages. Defaults to 993.
+  IMAP messages. Defaults to 993.
 * `REMOTE_IMAP_HOST` String, the host to which the server will forward the
-IMAP messages. Required.
+  IMAP messages. Required.
 
 * `LOCAL_SMTP_PORT` u16, the port in which the server will listen for
-SMTP clients. Defaults to 25.
+  SMTP clients. Defaults to 25.
 * `LOCAL_SMTP_BIND_ADDRESS` String, the address on which to listen for
-SMTP clients. Defaults to 0.0.0.0.
+  SMTP clients. Defaults to 0.0.0.0.
 * `REMOTE_SMTP_PORT` u16, the port to which the server will forward the
-SMTP messages. Defaults to 465.
+  SMTP messages. Defaults to 465.
 * `REMOTE_SMTP_HOST` String, the host to which the server will forward the
-SMTP messages. Required.
+  SMTP messages. Required.
 
 This means the minimum invocation is this (Shown here with inline
 environment variables)
 
 ```
-% REMOTE_IMAP_DOMAIN=imap.coolmailsite.example REMOTE_SMTP_DOMAIN=smtp.coolmailsite.example olden-mail
+% REMOTE_IMAP_HOST=imap.coolmailsite.example REMOTE_SMTP_HOST=smtp.coolmailsite.example olden-mail
 ```
 
+## Middleware
+
+In order to work with some older clients, middleware allow transformation of
+messages. The current middleware are:
+
+- `FindMailboxesCompatibility` - Transforms IMAPv3 FIND MAILBOX commands to
+    IMAPv4 LIST commands.
+
 ## Debugging
 
 You can control how much it prints by setting `RUST_LOG`. Setting it to
 `debug` will output the whole protocol stream. The default level is
 `info`.
+
+Messages coming from the client are prefixed with `>>>`, and messages coming
+from the server with `<<<`. If a middleware modified a command, you'll see
+the message that was actually sent prefixed with `###`.