fix: skip mailbox sync when uid_validity is None

src/modules/cache/imap/sync/flow.rs

@@ -310,6 +310,13 @@ pub async fn compare_and_sync_mailbox(
         let mut mailboxes_to_update = Vec::with_capacity(existing_mailboxes.len());
         for (local_mailbox, remote_mailbox) in &existing_mailboxes {
             if local_mailbox.uid_validity != remote_mailbox.uid_validity {
+                if remote_mailbox.uid_validity.is_none() {
+                    warn!(
+                        "Account {}: Mailbox '{}' has invalid uid_validity (None). Skipping sync for this mailbox.",
+                        account_id, local_mailbox.name
+                    );
+                    continue;
+                }
                 info!(
                     "Account {}: Mailbox '{}' detected with changed uid_validity (local: {:#?}, remote: {:#?}). \
                     The mailbox data may be invalid, resetting its envelopes and rebuilding the cache.",

src/modules/cache/imap/sync/mod.rs

@@ -29,7 +29,7 @@ pub mod sync_type;
 
 static SYNC_COUNTER: AtomicUsize = AtomicUsize::new(0);
 
-pub async fn execute_account_sync(account: &AccountV2) -> RustMailerResult<()> {
+pub async fn execute_imap_sync(account: &AccountV2) -> RustMailerResult<()> {
     let start_time = Instant::now();
     let account_id = account.id;
 

src/modules/cache/imap/task.rs

@@ -3,7 +3,7 @@
 // Unauthorized copying, modification, or distribution is prohibited.
 
 use crate::modules::account::entity::{AuthType, MailerType};
-use crate::modules::cache::imap::sync::execute_account_sync;
+use crate::modules::cache::imap::sync::execute_imap_sync;
 use crate::modules::oauth2::token::OAuth2AccessToken;
 use crate::modules::scheduler::periodic::TaskHandle;
 use crate::modules::{
@@ -71,7 +71,7 @@ impl AccountSyncTask {
                                     return Ok(());
                                 }
                             }
-                                if let Err(e) = execute_account_sync(&account).await {
+                                if let Err(e) = execute_imap_sync(&account).await {
                                     STATUS_DISPATCHER
                                         .append_error(
                                             account_id,