diff --git a/opensmtpd-derive/src/lib.rs b/opensmtpd-derive/src/lib.rs
index 112e7b2..09a81d1 100644
--- a/opensmtpd-derive/src/lib.rs
+++ b/opensmtpd-derive/src/lib.rs
@@ -14,7 +14,7 @@ pub fn event(attr: TokenStream, input: TokenStream) -> TokenStream {
     let fn_output = &item.decl.output;
     let output = quote! {
         fn #fn_name() -> opensmtpd::EventHandler {
-            opensmtpd::EventHandler::new(#attr.to_string(), |#fn_params| #fn_output #fn_body)
+            opensmtpd::EventHandler::new(#attr, |#fn_params| #fn_output #fn_body)
         }
     };
     output.into()
diff --git a/opensmtpd/src/event_handlers.rs b/opensmtpd/src/event_handlers.rs
index d42a9f9..c573eb7 100644
--- a/opensmtpd/src/event_handlers.rs
+++ b/opensmtpd/src/event_handlers.rs
@@ -15,32 +15,29 @@ pub struct EventHandler {
 }
 
 impl EventHandler {
-    fn get_events_from_string(event_str: &String) -> MatchEvent {
+    fn get_events_from_string(event_str: &str) -> MatchEvent {
         let mut events = Vec::new();
         for name in event_str.split(" , ") {
             match name {
                 "Any" | "All" => {
                     return MatchEvent::All;
                 }
-                _ => match Event::from_str(name) {
-                    Ok(e) => {
-                        events.push(e);
-                    }
-                    Err(_) => {}
+                _ => if let Ok(e) = Event::from_str(name) {
+                    events.push(e);
                 },
             }
         }
         MatchEvent::Evt(events)
     }
 
-    pub fn new(event_str: String, callback: (fn(&Entry) -> Response)) -> Self {
+    pub fn new(event_str: &str, callback: (fn(&Entry) -> Response)) -> Self {
         EventHandler {
-            event: EventHandler::get_events_from_string(&event_str),
+            event: EventHandler::get_events_from_string(event_str),
             callback,
         }
     }
 
-    pub fn is_callable(&self, event: Event) -> bool {
+    pub fn is_callable(&self, event: &Event) -> bool {
         match &self.event {
             MatchEvent::All => true,
             MatchEvent::Evt(v) => v.contains(&event),
diff --git a/opensmtpd/src/lib.rs b/opensmtpd/src/lib.rs
index 0babb7d..99600a8 100644
--- a/opensmtpd/src/lib.rs
+++ b/opensmtpd/src/lib.rs
@@ -37,7 +37,7 @@ struct SessionHandler {
 }
 
 impl SessionHandler {
-    fn new(entry_rx: mpsc::Receiver<Entry>, handlers_rx: mpsc::Receiver<EventHandler>) -> Self {
+    fn new(entry_rx: mpsc::Receiver<Entry>, handlers_rx: &mpsc::Receiver<EventHandler>) -> Self {
         debug!(
             "New thread for session {}",
             thread::current().name().unwrap()
@@ -56,7 +56,7 @@ impl SessionHandler {
     fn read_entries(&self) {
         for e in self.entry_rx.iter() {
             for h in self.event_handlers.iter() {
-                if h.is_callable(e.event.clone()) {
+                if h.is_callable(&e.event) {
                     h.call(&e);
                 }
             }
@@ -64,6 +64,7 @@ impl SessionHandler {
     }
 }
 
+#[derive(Default)]
 pub struct SmtpIn {
     sessions: HashMap<u64, (mpsc::Sender<Entry>, thread::JoinHandle<()>)>,
     event_handlers: Vec<EventHandler>,
@@ -94,7 +95,7 @@ impl SmtpIn {
                 let (entry_tx, entry_rx) = mpsc::channel();
                 let name = entry.session_id.to_string();
                 let handle = thread::Builder::new().name(name).spawn(move || {
-                    SessionHandler::new(entry_rx, handlers_rx).read_entries();
+                    SessionHandler::new(entry_rx, &handlers_rx).read_entries();
                 })?;
                 for h in self.event_handlers.iter() {
                     handlers_tx.send(h.clone())?;
@@ -133,7 +134,7 @@ impl SmtpIn {
     }
 
     pub fn event_handlers(&mut self, handlers: Vec<EventHandler>) -> &mut Self {
-        self.event_handlers = handlers.clone();
+        self.event_handlers = handlers.to_owned();
         self
     }