normalize email from

src/state.rs

@@ -11,10 +11,18 @@ use tokio::sync::{RwLock, broadcast};
 
 const CHANNEL_CAPACITY: usize = 256;
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum SmtpSecurity {
+    None,
+    StartTls,
+    Tls,
+}
+
 #[derive(Debug, Clone)]
 pub struct SmtpConfig {
     pub host: String,
     pub port: u16,
+    pub security: SmtpSecurity,
     pub username: String,
     pub password: String,
     pub from: String,