diff --git a/app/config.py b/app/config.py
index 6e660f8f..e8824f5a 100644
--- a/app/config.py
+++ b/app/config.py
@@ -421,6 +421,8 @@ try:
 except Exception:
     HIBP_SCAN_INTERVAL_DAYS = 7
 HIBP_API_KEYS = sl_getenv("HIBP_API_KEYS", list) or []
+HIBP_MAX_ALIAS_CHECK = 10_000
+HIBP_RPM = 100
 
 POSTMASTER = os.environ.get("POSTMASTER")
 
diff --git a/cron.py b/cron.py
index 3626d699..503046e8 100644
--- a/cron.py
+++ b/cron.py
@@ -5,7 +5,7 @@ from typing import List, Tuple
 
 import arrow
 import requests
-from sqlalchemy import func, desc, or_, and_
+from sqlalchemy import func, desc, or_, and_, nullsfirst
 from sqlalchemy.ext.compiler import compiles
 from sqlalchemy.orm import joinedload
 from sqlalchemy.orm.exc import ObjectDeletedError
@@ -962,6 +962,9 @@ async def _hibp_check(api_key, queue):
 
     This function to be ran simultaneously (multiple _hibp_check functions with different keys on the same queue) to make maximum use of multiple API keys.
     """
+    default_rate_sleep = (60.0 / config.HIBP_RPM) + 0.1
+    rate_sleep = default_rate_sleep
+    rate_hit_counter = 0
     while True:
         try:
             alias_id = queue.get_nowait()
@@ -969,9 +972,11 @@ async def _hibp_check(api_key, queue):
             return
 
         alias = Alias.get(alias_id)
-        # an alias can be deleted in the meantime
         if not alias:
-            return
+            continue
+        user = alias.user
+        if user.disabled or not user.is_paid():
+            continue
 
         LOG.d("Checking HIBP for %s", alias)
 
@@ -983,7 +988,6 @@ async def _hibp_check(api_key, queue):
             f"https://haveibeenpwned.com/api/v3/breachedaccount/{urllib.parse.quote(alias.email)}",
             headers=request_headers,
         )
-
         if r.status_code == 200:
             # Breaches found
             alias.hibp_breaches = [
@@ -991,20 +995,27 @@ async def _hibp_check(api_key, queue):
             ]
             if len(alias.hibp_breaches) > 0:
                 LOG.w("%s appears in HIBP breaches %s", alias, alias.hibp_breaches)
+            if rate_hit_counter > 0:
+                rate_hit_counter -= 1
         elif r.status_code == 404:
             # No breaches found
             alias.hibp_breaches = []
         elif r.status_code == 429:
             # rate limited
             LOG.w("HIBP rate limited, check alias %s in the next run", alias)
-            await asyncio.sleep(1.6)
-            return
+            rate_hit_counter += 1
+            rate_sleep = default_rate_sleep + (0.2 * rate_hit_counter)
+            if rate_hit_counter > 10:
+                LOG.w(f"HIBP rate limited too many times stopping with alias {alias}")
+                return
+            # Just sleep for a while
+            asyncio.sleep(5)
         elif r.status_code > 500:
             LOG.w("HIBP server 5** error %s", r.status_code)
             return
         else:
             LOG.error(
-                "An error occured while checking alias %s: %s - %s",
+                "An error occurred while checking alias %s: %s - %s",
                 alias,
                 r.status_code,
                 r.text,
@@ -1015,9 +1026,8 @@ async def _hibp_check(api_key, queue):
         Session.add(alias)
         Session.commit()
 
-        LOG.d("Updated breaches info for %s", alias)
-
-        await asyncio.sleep(1.6)
+        LOG.d("Updated breach info for %s", alias)
+        await asyncio.sleep(rate_sleep)
 
 
 async def check_hibp():
@@ -1040,15 +1050,22 @@ async def check_hibp():
     Session.commit()
     LOG.d("Updated list of known breaches")
 
+    LOG.d("Getting the list of users to skip")
+    query = "select u.id, count(a.id) from users u, alias a where a.user_id=u.id group by u.id having count(a.id) > :max_alias"
+    rows = Session.execute(query, {"max_alias": config.HIBP_MAX_ALIAS_CHECK})
+    user_ids = [row[0] for row in rows]
+    LOG.d("Got %d users to skip" % len(user_ids))
+
     LOG.d("Preparing list of aliases to check")
     queue = asyncio.Queue()
     max_date = arrow.now().shift(days=-config.HIBP_SCAN_INTERVAL_DAYS)
     for alias in (
         Alias.filter(
-            or_(Alias.hibp_last_check.is_(None), Alias.hibp_last_check < max_date)
+            or_(Alias.hibp_last_check.is_(None), Alias.hibp_last_check < max_date),
+            Alias.user_id.notin_(user_ids),
         )
         .filter(Alias.enabled)
-        .order_by(Alias.hibp_last_check.asc())
+        .order_by(nullsfirst(Alias.hibp_last_check.asc()), Alias.id.asc())
         .yield_per(500)
         .enable_eagerloads(False)
     ):