Fix MTA: Resume queue processing does not work

CHANGELOG.md

@@ -22,6 +22,7 @@ If you are upgrading from v0.16.x, replace the binary (or run `docker pull`). If
 - Reject invalid duration values (e.g. `1h30m`).
 - Branding: Custom logos for domains do not work.
 - Sieve: add `Received` headers to auto-generated messages and detect loops.
+- MTA: Resume queue processing does not work.
 
 ## [0.16.12] - 2026-07-06
 

crates/smtp/src/queue/manager.rs

@@ -201,7 +201,7 @@ impl Queue {
                     .queue_status
                     .store(!paused, Ordering::Relaxed);
                 self.is_paused = paused;
-                false
+                !paused
             }
             QueueEvent::ReloadSettings => {
                 let server = self.core.build_server();