diff --git a/Cargo.toml b/Cargo.toml
index 1cc143e..557be55 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -58,7 +58,7 @@ aws-sdk-s3 = "1.9.0"
 eml-codec = { git = "https://git.deuxfleurs.fr/Deuxfleurs/eml-codec.git", branch = "main" }
 smtp-message = { git = "http://github.com/Alexis211/kannader", branch = "feature/lmtp" }
 smtp-server = { git = "http://github.com/Alexis211/kannader", branch = "feature/lmtp" }
-imap-codec = { version = "1.0.0", features = ["quirk_crlf_relaxed", "bounded-static"] }
+imap-codec = { version = "1.0.0", features = ["quirk_crlf_relaxed", "bounded-static", "ext_condstore_qresync"] }
 imap-flow = { git = "https://github.com/duesee/imap-flow.git", rev = "e45ce7bb6ab6bda3c71a0c7b05e9b558a5902e90" }
 
 [dev-dependencies]
diff --git a/src/imap/capability.rs b/src/imap/capability.rs
index b98e8f8..f6b5a51 100644
--- a/src/imap/capability.rs
+++ b/src/imap/capability.rs
@@ -1,10 +1,24 @@
 use imap_codec::imap_types::core::NonEmptyVec;
 use imap_codec::imap_types::response::Capability;
 
+fn capability_unselect() -> Capability<'static> {
+    Capability::try_from("UNSELECT").unwrap()
+}
+
+fn capability_condstore() -> Capability<'static> {
+    Capability::try_from("CONDSTORE").unwrap()
+}
+
+fn capability_qresync() -> Capability<'static> {
+    Capability::try_from("QRESYNC").unwrap()
+}
+
 #[derive(Debug, Clone)]
 pub struct ServerCapability {
     r#move: bool,
     unselect: bool,
+    condstore: bool,
+    qresync: bool,
 }
 
 impl Default for ServerCapability {
@@ -12,6 +26,8 @@ impl Default for ServerCapability {
         Self {
             r#move: true,
             unselect: true,
+            condstore: false,
+            qresync: false,
         }
     }
 }
@@ -23,8 +39,64 @@ impl ServerCapability {
             acc.push(Capability::Move);
         }
         if self.unselect {
-            acc.push(Capability::try_from("UNSELECT").unwrap());
+            acc.push(capability_unselect());
+        }
+        if self.condstore {
+            acc.push(capability_condstore());
+        }
+        if self.qresync {
+            acc.push(capability_qresync());
         }
         acc.try_into().unwrap()
     }
+
+    pub fn support(&self, cap: &Capability<'static>) -> bool {
+        match cap {
+            Capability::Imap4Rev1 => true,
+            Capability::Move => self.r#move,
+            x if *x == capability_condstore() => self.condstore,
+            x if *x == capability_qresync() => self.qresync,
+            x if *x == capability_unselect() => self.unselect,
+            _ => false,
+        }
+    }
+}
+
+pub struct ClientCapability {
+    condstore: bool,
+    qresync: bool,
+}
+
+impl Default for ClientCapability {
+    fn default() -> Self {
+        Self {
+            condstore: false,
+            qresync: false,
+        }
+    }
+}
+
+impl ClientCapability {
+    pub fn try_enable(
+        &mut self,
+        srv: &ServerCapability,
+        caps: &[Capability<'static>],
+    ) -> Vec<Capability<'static>> {
+        let mut enabled = vec![];
+        for cap in caps {
+            match cap {
+                x if *x == capability_condstore() && srv.condstore && !self.condstore => {
+                    self.condstore = true;
+                    enabled.push(x.clone());
+                }
+                x if *x == capability_qresync() && srv.qresync && !self.qresync => {
+                    self.qresync = true;
+                    enabled.push(x.clone());
+                }
+                _ => (),
+            }
+        }
+
+        enabled
+    }
 }
diff --git a/src/imap/command/authenticated.rs b/src/imap/command/authenticated.rs
index 2970b63..fbf29f9 100644
--- a/src/imap/command/authenticated.rs
+++ b/src/imap/command/authenticated.rs
@@ -305,6 +305,9 @@ impl<'a> AuthenticatedContext<'a> {
                 StatusDataItemName::DeletedStorage => {
                     bail!("quota not implemented, can't return freed storage after EXPUNGE will be run");
                 },
+                StatusDataItemName::HighestModSeq => {
+                    bail!("highestmodseq not yet implemented");
+                }
             });
         }
 
@@ -524,7 +527,7 @@ impl<'a> AuthenticatedContext<'a> {
         };
 
         if date.is_some() {
-            bail!("Cannot set date when appending message");
+            tracing::warn!("Cannot set date when appending message");
         }
 
         let msg =
diff --git a/src/imap/mod.rs b/src/imap/mod.rs
index 0b5555a..aac1fd3 100644
--- a/src/imap/mod.rs
+++ b/src/imap/mod.rs
@@ -89,7 +89,7 @@ async fn client_wrapper(ctx: ClientContext) {
     let addr = ctx.addr.clone();
     match client(ctx).await {
         Ok(()) => {
-            tracing::info!("closing successful session for {:?}", addr);
+            tracing::debug!("closing successful session for {:?}", addr);
         }
         Err(e) => {
             tracing::error!("closing errored session for {:?}: {}", addr, e);
@@ -127,7 +127,9 @@ async fn client(mut ctx: ClientContext) -> Result<()> {
                 Some(cmd_recv) => cmd_recv,
             };
 
+            tracing::debug!(cmd=?cmd, sock=%ctx.addr, "command");
             let maybe_response = session.command(cmd).await;
+            tracing::debug!(cmd=?maybe_response.completion, sock=%ctx.addr, "response");
 
             match resp_tx.send(maybe_response) {
                 Err(_) => break,
diff --git a/src/mail/incoming.rs b/src/mail/incoming.rs
index 04d2ef1..781d8dc 100644
--- a/src/mail/incoming.rs
+++ b/src/mail/incoming.rs
@@ -9,7 +9,7 @@ use base64::Engine;
 use futures::{future::BoxFuture, FutureExt};
 //use tokio::io::AsyncReadExt;
 use tokio::sync::watch;
-use tracing::{error, info, warn};
+use tracing::{debug, error, info, warn};
 
 use crate::cryptoblob;
 use crate::login::{Credentials, PublicCredentials};
@@ -62,7 +62,7 @@ async fn incoming_mail_watch_process_internal(
 
     loop {
         let maybe_updated_incoming_key = if *lock_held.borrow() {
-            info!("incoming lock held");
+            debug!("incoming lock held");
 
             let wait_new_mail = async {
                 loop {
@@ -83,7 +83,7 @@ async fn incoming_mail_watch_process_internal(
                 _     = rx_inbox_id.changed() => None,
             }
         } else {
-            info!("incoming lock not held");
+            debug!("incoming lock not held");
             tokio::select! {
                 _ = lock_held.changed() => None,
                 _ = rx_inbox_id.changed() => None,
@@ -93,11 +93,11 @@ async fn incoming_mail_watch_process_internal(
         let user = match Weak::upgrade(&user) {
             Some(user) => user,
             None => {
-                info!("User no longer available, exiting incoming loop.");
+                debug!("User no longer available, exiting incoming loop.");
                 break;
             }
         };
-        info!("User still available");
+        debug!("User still available");
 
         // If INBOX no longer is same mailbox, open new mailbox
         let inbox_id = *rx_inbox_id.borrow();
@@ -235,7 +235,7 @@ async fn k2v_lock_loop_internal(
     let watch_lock_loop: BoxFuture<Result<()>> = async {
         let mut ct = row_ref.clone();
         loop {
-            info!("k2v watch lock loop iter: ct = {:?}", ct);
+            debug!("k2v watch lock loop iter: ct = {:?}", ct);
             match storage.row_poll(&ct).await {
                 Err(e) => {
                     error!(
@@ -263,7 +263,7 @@ async fn k2v_lock_loop_internal(
                     }
                     let new_ct = cv.row_ref;
 
-                    info!(
+                    debug!(
                         "k2v watch lock loop: changed, old ct = {:?}, new ct = {:?}, v = {:?}",
                         ct, new_ct, lock_state
                     );
@@ -378,7 +378,7 @@ async fn k2v_lock_loop_internal(
 
     let _ = futures::try_join!(watch_lock_loop, lock_notify_loop, take_lock_loop);
 
-    info!("lock loop exited, releasing");
+    debug!("lock loop exited, releasing");
 
     if !held_tx.is_closed() {
         warn!("weird...");