Fix HTTP: Idle keep-alive connections are never closed

CHANGELOG.md

@@ -29,8 +29,10 @@ If you are upgrading from v0.16.x, replace the binary (or run `docker pull`). If
 - MTA:
   - A node without the `outboundMta` role stops replying to `DATA` and to JMAP submissions once about 1024 messages have been queued on it.
   - MX records are resolved through the DNSSEC-validating resolver even when DANE is disabled.
+  - A `DATA` stage Sieve script does not see headers added by milters or MTA hooks, and discards every milter and MTA hook change when it edits the message.
 - MySQL: Range deletions and search index removals start with a single unbounded `DELETE` and switch to chunks only after a timeout.
 - Autodiscover: Implicit TLS ports (993, 995, 465) are advertised with `<Encryption>TLS</Encryption>`, which Outlook reads as STARTTLS.
+- HTTP: Idle keep-alive connections are never closed.
 
 ## [0.16.23] - 2026-09-21
 

crates/http/src/request.rs

@@ -34,7 +34,7 @@ use hyper::{
     server::conn::http1,
     service::service_fn,
 };
-use hyper_util::rt::TokioIo;
+use hyper_util::rt::{TokioIo, TokioTimer};
 use jmap::{
     api::{
         ToJmapHttpResponse, event_source::EventSourceHandler, request::RequestHandler,
@@ -735,6 +735,7 @@ async fn handle_session<T: SessionStream>(inner: Arc<Inner>, session: SessionDat
     let is_tls = session.stream.is_tls();
 
     if let Err(http_err) = http1::Builder::new()
+        .timer(TokioTimer::new())
         .keep_alive(true)
         .serve_connection(
             TokioIo::new(session.stream),
@@ -879,6 +880,7 @@ async fn handle_session<T: SessionStream>(inner: Arc<Inner>, session: SessionDat
         )
         .with_upgrades()
         .await
+        && !http_err.is_timeout()
     {
         if http_err.is_parse() {
             let server = inner.build_server();

crates/smtp/src/inbound/hooks/message.rs

@@ -132,7 +132,7 @@ impl<T: SessionStream> Session<T> {
                                 name: "X-Quarantine".into(),
                                 value: "true".into(),
                             });
-                            FilterResponse::accept()
+                            continue;
                         }
                     };