chore: Run clippy (#77)

core/src/lib.rs

@@ -80,9 +80,9 @@ impl Serialize for SingleEmail {
 /// The main function: checks email format, checks MX records, and checks SMTP
 /// responses to the email inbox.
 pub fn email_exists(to_email: &str, from_email: &str) -> SingleEmail {
-	let from_email = EmailAddress::from_str(from_email).unwrap_or(
-		EmailAddress::from_str("[email protected]").expect("This is a valid email. qed."),
-	);
+	let from_email = EmailAddress::from_str(from_email).unwrap_or_else(|_| {
+		EmailAddress::from_str("[email protected]").expect("This is a valid email. qed.")
+	});
 
 	debug!("Checking email '{}'", to_email);
 	let my_syntax = match address_syntax(to_email) {

core/src/syntax.rs

@@ -61,7 +61,7 @@ pub fn address_syntax(email_address: &str) -> Result<SyntaxDetails, SyntaxError>
 	};
 
 	let iter: &str = email_address.as_ref();
-	let mut iter = iter.split("@");
+	let mut iter = iter.split('@');
 	let username = iter
 		.next()
 		.expect("We checked above that email is valid. qed.")