diff --git a/opensmtpd/src/data_line.rs b/opensmtpd/src/data_line.rs
index dc5c97c..a9829d4 100644
--- a/opensmtpd/src/data_line.rs
+++ b/opensmtpd/src/data_line.rs
@@ -4,5 +4,5 @@ use std::io::{self, Write};
 pub fn return_data_line(entry: &FilterEntry, data_line: &[u8]) {
     print!("filter-dataline|{}|{}|", entry.session_id, entry.token);
     io::stdout().write_all(data_line).unwrap();
-    println!("");
+    println!();
 }
diff --git a/opensmtpd/src/filter.rs b/opensmtpd/src/filter.rs
index 1400ca5..dd6cb6d 100644
--- a/opensmtpd/src/filter.rs
+++ b/opensmtpd/src/filter.rs
@@ -9,7 +9,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_auth(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_commit(&mut self, _entry: &FilterEntry) -> FilterResponse {
@@ -17,7 +17,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_commit(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_connect(
@@ -32,7 +32,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_connect(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_data(&mut self, _entry: &FilterEntry) -> FilterResponse {
@@ -40,13 +40,13 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_data(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_data_line(&mut self, _entry: &FilterEntry, _data_line: &[u8]) {}
     #[doc(hidden)]
     fn has_filter_data_line(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_ehlo(&mut self, _entry: &FilterEntry, _identity: &str) -> FilterResponse {
@@ -54,7 +54,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_ehlo(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_helo(&mut self, _entry: &FilterEntry, _identity: &str) -> FilterResponse {
@@ -62,7 +62,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_helo(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_mail_from(&mut self, _entry: &FilterEntry, _address: &str) -> FilterResponse {
@@ -70,7 +70,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_mail_from(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_rcpt_to(&mut self, _entry: &FilterEntry, _address: &str) -> FilterResponse {
@@ -78,7 +78,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_rcpt_to(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_filter_starttls(&mut self, _entry: &FilterEntry, _tls_string: &str) -> FilterResponse {
@@ -86,13 +86,13 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_filter_starttls(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_link_auth(&mut self, _entry: &ReportEntry, _username: &str, _result: AuthResult) {}
     #[doc(hidden)]
     fn has_report_link_auth(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_link_connect(
@@ -106,37 +106,37 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_report_link_connect(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_link_disconnect(&mut self, _entry: &ReportEntry) {}
     #[doc(hidden)]
     fn has_report_link_disconnect(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_link_greeting(&mut self, _entry: &ReportEntry, _hostname: &str) {}
     #[doc(hidden)]
     fn has_report_link_greeting(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_link_identify(&mut self, _entry: &ReportEntry, _method: Method, _identity: &str) {}
     #[doc(hidden)]
     fn has_report_link_identify(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_link_tls(&mut self, _entry: &ReportEntry, _tls_string: &str) {}
     #[doc(hidden)]
     fn has_report_link_tls(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_begin(&mut self, _entry: &ReportEntry, _message_id: &str) {}
     #[doc(hidden)]
     fn has_report_tx_begin(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_mail(
@@ -149,13 +149,13 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_report_tx_mail(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_reset(&mut self, _entry: &ReportEntry, _message_id: &Option<String>) {}
     #[doc(hidden)]
     fn has_report_tx_reset(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_rcpt(
@@ -168,7 +168,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_report_tx_rcpt(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_envelope(
@@ -180,13 +180,13 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_report_tx_envelope(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_data(&mut self, _entry: &ReportEntry, _message_id: &str, _result: MailResult) {}
     #[doc(hidden)]
     fn has_report_tx_data(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_commit(
@@ -198,25 +198,25 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_report_tx_commit(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_tx_rollback(&mut self, _entry: &ReportEntry, _message_id: &str) {}
     #[doc(hidden)]
     fn has_report_tx_rollback(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_protocol_client(&mut self, _entry: &ReportEntry, _command: &str) {}
     #[doc(hidden)]
     fn has_report_protocol_client(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_protocol_server(&mut self, _entry: &ReportEntry, _response: &str) {}
     #[doc(hidden)]
     fn has_report_protocol_server(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_filter_response(
@@ -229,7 +229,7 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_report_filter_response(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_filter_report(
@@ -242,12 +242,12 @@ pub trait Filter {
     }
     #[doc(hidden)]
     fn has_report_filter_report(&self) -> bool {
-        return false;
+        false
     }
 
     fn on_report_timeout(&mut self, _entry: &ReportEntry) {}
     #[doc(hidden)]
     fn has_report_timeout(&self) -> bool {
-        return false;
+        false
     }
 }
diff --git a/opensmtpd/src/io.rs b/opensmtpd/src/io.rs
index a357d4e..22a2d75 100644
--- a/opensmtpd/src/io.rs
+++ b/opensmtpd/src/io.rs
@@ -29,20 +29,13 @@ fn do_read_stdin(tx: &Sender<Vec<u8>>) -> Result<(), String> {
             return Err(String::from("unable to read on stdin"));
         }
         line_buffer.extend_from_slice(&read_buffer[..len]);
-        loop {
-            match line_buffer.iter().position(|i| *i == b'\n') {
-                Some(id) => {
-                    let pos = id + 1;
-                    let mut line = Vec::with_capacity(pos);
-                    line.extend_from_slice(&line_buffer[..pos]);
-                    log::trace!("new line:{}", get_pretty_hex(&line));
-                    tx.send(line).unwrap();
-                    line_buffer.drain(..pos);
-                }
-                None => {
-                    break;
-                }
-            };
+        while let Some(id) = line_buffer.iter().position(|i| *i == b'\n') {
+            let pos = id + 1;
+            let mut line = Vec::with_capacity(pos);
+            line.extend_from_slice(&line_buffer[..pos]);
+            log::trace!("new line:{}", get_pretty_hex(&line));
+            tx.send(line).unwrap();
+            line_buffer.drain(..pos);
         }
     }
 }