diff --git a/src/api/admin.rs b/src/api/admin.rs
index c7325965..4f03a9c4 100644
--- a/src/api/admin.rs
+++ b/src/api/admin.rs
@@ -360,10 +360,7 @@ fn oauth2_authorize(_token: AdminToken) -> Result<Redirect, Error> {
     let state = crate::crypto::encode_random_bytes::<32>(BASE64URL_NOPAD);
 
     // Store state with expiration (10 minutes from now)
-    let expiration = SystemTime::now()
-        .duration_since(UNIX_EPOCH)
-        .unwrap()
-        .as_secs() + 600;
+    let expiration = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs() + 600;
 
     OAUTH2_STATES.write().unwrap().insert(state.clone(), expiration);
 
@@ -411,7 +408,7 @@ async fn oauth2_callback(params: OAuth2CallbackParams) -> Result<Html<String>, E
     let valid_state = {
         let states = OAUTH2_STATES.read().unwrap();
         let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs();
-        states.get(&state).map_or(false, |&exp| exp > now)
+        states.get(&state).is_some_and(|&exp| exp > now)
     };
 
     if !valid_state {
@@ -449,16 +446,12 @@ async fn oauth2_callback(params: OAuth2CallbackParams) -> Result<Html<String>, E
         return Err(Error::new("OAuth2 Token Exchange Failed", format!("HTTP {}: {}", status, body)));
     }
 
-    let token_response: Value = response
-        .json()
-        .await
-        .map_err(|e| Error::new("OAuth2 Token Parse Error", e.to_string()))?;
+    let token_response: Value =
+        response.json().await.map_err(|e| Error::new("OAuth2 Token Parse Error", e.to_string()))?;
 
     // Extract refresh_token from response
-    let refresh_token = token_response
-        .get("refresh_token")
-        .and_then(|v| v.as_str())
-        .ok_or("No refresh_token in response")?;
+    let refresh_token =
+        token_response.get("refresh_token").and_then(|v| v.as_str()).ok_or("No refresh_token in response")?;
 
     // Save refresh_token to configuration
     let config_builder: ConfigBuilder = serde_json::from_value(json!({
diff --git a/src/config.rs b/src/config.rs
index 377912d9..b7b89bad 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -1146,10 +1146,7 @@ fn validate_config(cfg: &ConfigItems) -> Result<(), Error> {
     }
 
     // OAuth2 validation - triggered when SMTP Auth mechanism includes xoauth2
-    let uses_xoauth2 = cfg.smtp_auth_mechanism
-        .as_ref()
-        .map(|m| m.to_lowercase().contains("xoauth2"))
-        .unwrap_or(false);
+    let uses_xoauth2 = cfg.smtp_auth_mechanism.as_ref().map(|m| m.to_lowercase().contains("xoauth2")).unwrap_or(false);
 
     if uses_xoauth2 {
         if cfg.smtp_oauth2_client_id.is_none() {
diff --git a/src/mail.rs b/src/mail.rs
index 31e6a810..422b61d9 100644
--- a/src/mail.rs
+++ b/src/mail.rs
@@ -1,9 +1,9 @@
 use chrono::NaiveDateTime;
 use percent_encoding::{percent_encode, NON_ALPHANUMERIC};
-use std::{env::consts::EXE_SUFFIX, str::FromStr};
+use serde::{Deserialize, Serialize};
 use std::sync::{LazyLock, RwLock};
 use std::time::{SystemTime, UNIX_EPOCH};
-use serde::{Deserialize, Serialize};
+use std::{env::consts::EXE_SUFFIX, str::FromStr};
 
 use lettre::{
     message::{Attachment, Body, Mailbox, Message, MultiPart, SinglePart},
@@ -68,17 +68,12 @@ pub async fn refresh_oauth2_token() -> Result<OAuth2Token, Error> {
         return Err(Error::new("OAuth2 Token Refresh Failed", format!("HTTP {status}: {body}")));
     }
 
-    let token_response: TokenRefreshResponse = response
-        .json()
-        .await
-        .map_err(|e| Error::new("OAuth2 Token Parse Error", e.to_string()))?;
-
-    let expires_at = token_response.expires_in.map(|expires_in| {
-        SystemTime::now()
-            .duration_since(UNIX_EPOCH)
-            .unwrap()
-            .as_secs() + expires_in
-    });
+    let token_response: TokenRefreshResponse =
+        response.json().await.map_err(|e| Error::new("OAuth2 Token Parse Error", e.to_string()))?;
+
+    let expires_at = token_response
+        .expires_in
+        .map(|expires_in| SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs() + expires_in);
 
     Ok(OAuth2Token {
         access_token: token_response.access_token,