diff --git a/app/src/main/java/eu/faircode/email/ServiceSynchronize.java b/app/src/main/java/eu/faircode/email/ServiceSynchronize.java
index 5743ec662b..faa5d36db7 100644
--- a/app/src/main/java/eu/faircode/email/ServiceSynchronize.java
+++ b/app/src/main/java/eu/faircode/email/ServiceSynchronize.java
@@ -138,6 +138,7 @@ public class ServiceSynchronize extends LifecycleService {
     private static final long RECONNECT_BACKOFF = 60 * 1000L; // milliseconds
     private static final int PREVIEW_SIZE = 250;
     private static final int ACCOUNT_ERROR_AFTER = 60; // minutes
+    private static final int SEND_WAIT = 90; // seconds
 
     static final int PI_WHY = 1;
     static final int PI_CLEAR = 2;
@@ -1557,6 +1558,13 @@ public class ServiceSynchronize extends LifecycleService {
             }
 
             EntityOperation.process(this);
+
+            // Throttle send rate
+            try {
+                Thread.sleep(SEND_WAIT * 60 * 1000L);
+            } catch (InterruptedException ignored) {
+            }
+
         } catch (MessagingException ex) {
             db.identity().setIdentityError(ident.id, Helper.formatThrowable(ex));