diff --git a/src/service.rs b/src/service.rs
index 329e1af..fd45829 100644
--- a/src/service.rs
+++ b/src/service.rs
@@ -59,3 +59,73 @@ fn allow_email(input: &Input, addr_lst: &HashSet<KeyedAddress>) -> bool {
 	}
 	true
 }
+
+#[cfg(test)]
+mod tests {
+	use super::allow_email;
+	use crate::input::parse_input;
+	use crate::service::KeyedAddress;
+	use std::collections::HashSet;
+	use std::str::FromStr;
+
+	fn run_test_with_addr(address: &str) -> bool {
+		// Preparing the input
+		let input_str = format!("filter|0.5|1576146008.006099|smtp-in|rcpt-to|7641df9771b4ed00|1ef1c203cc576e5d|{address}");
+		let input = parse_input(&input_str);
+		assert!(input.is_ok());
+		let input = input.unwrap();
+
+		// Preparing the test keyed addresses
+		let kaddr_lst = [
+			"a@example.org:11voiefK5PgCX5F1TTcuoQ==",
+			"b:11voiefK5PgCX5F1TTcuoQ==",
+		];
+		let mut addr_set = HashSet::with_capacity(kaddr_lst.len());
+		for kaddr_str in kaddr_lst {
+			let keyed_addr = KeyedAddress::from_str(kaddr_str);
+			assert!(keyed_addr.is_ok());
+			let keyed_addr = keyed_addr.unwrap();
+			addr_set.insert(keyed_addr);
+		}
+
+		// Run the test
+		allow_email(&input, &addr_set)
+	}
+
+	#[test]
+	#[ignore]
+	fn test_valid_code_domain() {
+		assert!(run_test_with_addr("a+test+TODO@example.org"));
+	}
+
+	#[test]
+	#[ignore]
+	fn test_valid_code_no_domain() {
+		assert!(run_test_with_addr("b+test+TODO@example.org"));
+	}
+
+	#[test]
+	fn test_invalid_code_domain() {
+		assert!(!run_test_with_addr("a+test+orsxg5a@example.org"));
+	}
+
+	#[test]
+	fn test_invalid_code_no_domain() {
+		assert!(!run_test_with_addr("b+test+orsxg5a@example.org"));
+	}
+
+	#[test]
+	fn test_no_code() {
+		assert!(!run_test_with_addr("a+test@example.org"));
+	}
+
+	#[test]
+	fn test_no_sub_addr() {
+		assert!(!run_test_with_addr("b@example.org"));
+	}
+
+	#[test]
+	fn test_different_domain() {
+		assert!(run_test_with_addr("a@example.com"));
+	}
+}