Partially add REQUIRETLS. This doesn't yet handle the errors or sendi…

…ng parts. Only announces it

crates/erooster_smtp/src/commands/ehlo.rs

@@ -66,6 +66,7 @@ impl Ehlo<'_> {
         }
         if self.data.con_state.secure {
             lines.feed(String::from("250-AUTH LOGIN PLAIN")).await?;
+            lines.feed(String::from("250-REQUIRETLS")).await?;
         }
         lines.feed(String::from("250 SMTPUTF8")).await?;
         lines.flush().await?;

crates/erooster_smtp/src/commands/mail.rs

@@ -33,10 +33,12 @@ impl Mail<'_> {
             bail!("Failed to parse localpart arguments (no arguments)");
         }
 
+        // FIXME: This is just plain wrong
+        // TODO: Parse for `REQUIRETLS` as an argument to then set it on the data
         match localpart_arguments(command_data.arguments[0]).map(|(_, senders)| senders) {
             Ok(args) => {
                 // Create a resolver using Quad9 DNS
-                let resolver = Resolver::new_quad9_tls()?;
+                let resolver = Resolver::new_system_conf()?;
                 for sender in &args {
                     // Verify MAIL-FROM identity
                     let result = resolver

crates/erooster_smtp/src/servers/state.rs

@@ -9,6 +9,7 @@ use erooster_deps::mail_auth::SpfOutput;
 pub struct Connection {
     pub state: State,
     pub secure: bool,
+    pub require_tls: bool,
     pub receipts: Option<Vec<String>>,
     pub sender: Option<String>,
     pub ehlo: Option<String>,
@@ -20,6 +21,7 @@ impl Connection {
     pub const fn new(secure: bool, peer_addr: String) -> Self {
         Connection {
             secure,
+            require_tls: false,
             state: State::NotAuthenticated,
             receipts: None,
             sender: None,