diff --git a/src/main.rs b/src/main.rs
index a40047e..93d1969 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -15,7 +15,7 @@ async fn scan_repository(
     repository_name: String,
     github_token: &String,
     ignored_users: &Vec<&str>,
-    announced_users: &Vec<&str>,
+    announced_users: &Option<Vec<i32>>,
     ignored_labels: &Vec<&str>,
 ) -> Result<Vec<GithubPullRequest>, Error> {
     info!("Starting PR scan of {}", repository_name);
@@ -52,16 +52,18 @@ async fn scan_repository(
             continue;
         }
 
-        if !announced_users.contains(&pull_request.user().id().to_string().as_str()) {
-            info!("Users to announce: {:?}", announced_users);
-            info!(
-                "Ignoring PR {}({}) as it was raised by a user not included in the announced users list {}({})",
-                pull_request.id(),
-                pull_request.title(),
-                pull_request.user().id(),
-                pull_request.user().login()
-            );
-            continue;
+        if let Some(announced_users) = announced_users {
+            if !announced_users.contains(&pull_request.user().id()) {
+                info!("Users to announce: {:?}", announced_users);
+                info!(
+                    "Ignoring PR {}({}) as it was raised by a user not included in the announced users list {}({})",
+                    pull_request.id(),
+                    pull_request.title(),
+                    pull_request.user().id(),
+                    pull_request.user().login()
+                );
+                continue;
+            }
         }
 
         let mut has_ignore_label = false;
@@ -126,8 +128,9 @@ async fn main() -> Result<(), Error> {
         env::var("GOOGLE_WEBHOOK_URL").context("GOOGLE_WEBHOOK_URL must be set")?;
     let ignored_users: String = env::var("GITHUB_IGNORED_USERS").unwrap_or("".to_string());
     let ignored_users: Vec<&str> = ignored_users.split(",").collect();
-    let announced_users: String = env::var("GITHUB_ANNOUNCED_USERS").unwrap_or("".to_string());
-    let announced_users: Vec<&str> = announced_users.split(",").collect();
+    let announced_users: Option<Vec<i32>> = env::var("GITHUB_ANNOUNCED_USERS")
+        .ok()
+        .map(|s| s.split(',').map(|id| id.parse().unwrap()).collect());
     let ignored_labels: String = env::var("GITHUB_IGNORED_LABELS").unwrap_or("".to_string());
     let ignored_labels: Vec<&str> = ignored_labels.split(",").collect();
     let show_pr_age: bool = env::var("SHOW_PR_AGE")