Fix latest clippy warnings (#655)

src/message/body.rs

@@ -183,8 +183,8 @@ impl MaybeString {
     /// would result into an invalid encoded body.
     fn is_encoding_ok(&self, encoding: ContentTransferEncoding) -> bool {
         match encoding {
-            ContentTransferEncoding::SevenBit => is_7bit_encoded(&self),
-            ContentTransferEncoding::EightBit => is_8bit_encoded(&self),
+            ContentTransferEncoding::SevenBit => is_7bit_encoded(self),
+            ContentTransferEncoding::EightBit => is_8bit_encoded(self),
             ContentTransferEncoding::Binary
             | ContentTransferEncoding::QuotedPrintable
             | ContentTransferEncoding::Base64 => true,
@@ -342,7 +342,7 @@ where
 
 /// In place conversion to CRLF line endings
 fn in_place_crlf_line_endings(string: &mut String) {
-    let indices = find_all_lf_char_indices(&string);
+    let indices = find_all_lf_char_indices(string);
 
     for i in indices {
         // this relies on `indices` being in reverse order

src/message/header/mod.rs

@@ -163,7 +163,7 @@ impl Display for Headers {
         for (name, value) in &self.headers {
             Display::fmt(name, f)?;
             f.write_str(": ")?;
-            HeaderValueEncoder::encode(&name, &value, f)?;
+            HeaderValueEncoder::encode(name, value, f)?;
             f.write_str("\r\n")?;
         }
 
@@ -240,7 +240,7 @@ impl HeaderName {
 
 impl Display for HeaderName {
     fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
-        f.write_str(&self)
+        f.write_str(self)
     }
 }
 

src/message/mailbox/types.rs

@@ -70,7 +70,7 @@ impl Display for Mailbox {
         if let Some(ref name) = self.name {
             let name = name.trim();
             if !name.is_empty() {
-                f.write_str(&name)?;
+                f.write_str(name)?;
                 f.write_str(" <")?;
                 self.email.fmt(f)?;
                 return f.write_char('>');

src/message/mod.rs

@@ -523,7 +523,7 @@ impl EmailFormat for Message {
             MessageBody::Mime(p) => p.format(out),
             MessageBody::Raw(r) => {
                 out.extend_from_slice(b"\r\n");
-                out.extend_from_slice(&r)
+                out.extend_from_slice(r)
             }
         }
     }

src/transport/mod.rs

@@ -152,7 +152,7 @@ pub trait AsyncTransport {
     async fn send(&self, message: Message) -> Result<Self::Ok, Self::Error> {
         let raw = message.formatted();
         let envelope = message.envelope();
-        self.send_raw(&envelope, &raw).await
+        self.send_raw(envelope, &raw).await
     }
 
     async fn send_raw(&self, envelope: &Envelope, email: &[u8]) -> Result<Self::Ok, Self::Error>;

src/transport/sendmail/mod.rs

@@ -260,7 +260,7 @@ impl AsyncTransport for AsyncSendmailTransport<AsyncStd1Executor> {
             .stdin
             .as_mut()
             .unwrap()
-            .write_all(&email)
+            .write_all(email)
             .await
             .map_err(error::client)?;
         let output = process.output().await.map_err(error::client)?;
@@ -292,7 +292,7 @@ impl AsyncTransport for AsyncSendmailTransport<Tokio1Executor> {
             .stdin
             .as_mut()
             .unwrap()
-            .write_all(&email)
+            .write_all(email)
             .await
             .map_err(error::client)?;
         let output = process.wait_with_output().await.map_err(error::client)?;

src/transport/smtp/async_transport.rs

@@ -301,7 +301,7 @@ where
         .await?;
 
         if let Some(credentials) = &self.info.credentials {
-            conn.auth(&self.info.authentication, &credentials).await?;
+            conn.auth(&self.info.authentication, credentials).await?;
         }
         Ok(conn)
     }

src/transport/smtp/client/net.rs

@@ -161,7 +161,7 @@ impl NetworkStream {
 
                 let domain = DNSNameRef::try_from_ascii_str(tls_parameters.domain())
                     .map_err(error::connection)?;
-                let stream = StreamOwned::new(ClientSession::new(&connector, domain), tcp_stream);
+                let stream = StreamOwned::new(ClientSession::new(connector, domain), tcp_stream);
 
                 InnerNetworkStream::RustlsTls(stream)
             }

src/transport/smtp/transport.rs

@@ -225,7 +225,7 @@ impl SmtpClient {
         }
 
         if let Some(credentials) = &self.info.credentials {
-            conn.auth(&self.info.authentication, &credentials)?;
+            conn.auth(&self.info.authentication, credentials)?;
         }
         Ok(conn)
     }