update readme

README.md

@@ -39,8 +39,7 @@ specifics for everything
 | type  | host      | value                       | notes                      |
 |-------|-----------|---------------------------- |----------------------------|
 | `A`   | `@`       | `<ip>`                      | apex domain                |
-| `A`   | `mail`    | `<ip>`                      | mailserver                 |
-| `A`   | `post`    | `<ip>`                      | webmail                    |
+| `A`   | `*`       | `<ip>`                      | wildcard for subdomains    |
 | `CAA` | `@`       | `0 issue "letsencrypt.org"` | allow caddy to issue certs |
 
 ### stalwart
@@ -127,3 +126,9 @@ the restore process is kind of fucked up but doable
   - vaultwarden
 - tie all services together with an sso
 - use postgres for everything
+
+## misc
+
+**useful commands**
+
+- `docker exec <service> env`