diff --git a/crates/jmap-proto/src/types/keyword.rs b/crates/jmap-proto/src/types/keyword.rs
index 701baf81b..61cec658f 100644
--- a/crates/jmap-proto/src/types/keyword.rs
+++ b/crates/jmap-proto/src/types/keyword.rs
@@ -112,13 +112,17 @@ impl JsonObjectParser for Keyword {
 
 impl From<String> for Keyword {
     fn from(value: String) -> Self {
-        if value.starts_with('$') {
+        if value
+            .as_bytes()
+            .first()
+            .is_some_and(|&ch| [b'$', b'\\'].contains(&ch))
+        {
             let mut hash = 0;
             let mut shift = 0;
 
-            for &ch in value.as_bytes() {
+            for &ch in value.as_bytes().iter().skip(1) {
                 if shift < 128 {
-                    hash |= (ch as u128) << shift;
+                    hash |= (ch.to_ascii_lowercase() as u128) << shift;
                     shift += 8;
                 } else {
                     break;
diff --git a/tests/resources/jmap/sieve/test_mailbox.sieve b/tests/resources/jmap/sieve/test_mailbox.sieve
index d31462472..b60430f1c 100644
--- a/tests/resources/jmap/sieve/test_mailbox.sieve
+++ b/tests/resources/jmap/sieve/test_mailbox.sieve
@@ -38,7 +38,7 @@ if not mailboxexists ["Drafts", "Sent Items"] {
 
 # File into new mailboxes using flags
 fileinto :create "INBOX /  Folder  ";
-fileinto :flags ["$important", "$seen"] :create "My/Nested/Mailbox/with/multiple/levels";
+fileinto :flags ["$important", "\\Seen"] :create "My/Nested/Mailbox/with/multiple/levels";
 
 # Make sure all mailboxes were created
 if not mailboxexists "Inbox/Folder" {
diff --git a/tests/src/jmap/mod.rs b/tests/src/jmap/mod.rs
index 72160b9cb..3d7a78f69 100644
--- a/tests/src/jmap/mod.rs
+++ b/tests/src/jmap/mod.rs
@@ -381,14 +381,14 @@ pub async fn jmap_tests() {
     email_query_changes::test(&mut params).await;
     email_copy::test(&mut params).await;
     thread_get::test(&mut params).await;
-    thread_merge::test(&mut params).await;*/
+    thread_merge::test(&mut params).await;
     mailbox::test(&mut params).await;
     delivery::test(&mut params).await;
     auth_acl::test(&mut params).await;
     auth_limits::test(&mut params).await;
     auth_oauth::test(&mut params).await;
     event_source::test(&mut params).await;
-    push_subscription::test(&mut params).await;
+    push_subscription::test(&mut params).await;*/
     sieve_script::test(&mut params).await;
     vacation_response::test(&mut params).await;
     email_submission::test(&mut params).await;