diff --git a/zerver/lib/fix_unreads.py b/zerver/lib/fix_unreads.py
index 83576fe48b..24b283ea66 100644
--- a/zerver/lib/fix_unreads.py
+++ b/zerver/lib/fix_unreads.py
@@ -94,7 +94,7 @@ def fix_unsubscribed(cursor: CursorWrapper, user_profile: UserProfile) -> None:
         rows = cursor.fetchall()
         for row in rows:
             recipient_ids.append(row[0])
-        logger.info(str(recipient_ids))
+        logger.info("%s", recipient_ids)
 
     get_timing(
         "get recipients",
diff --git a/zerver/lib/send_email.py b/zerver/lib/send_email.py
index ab4209e3cc..ed067594d5 100644
--- a/zerver/lib/send_email.py
+++ b/zerver/lib/send_email.py
@@ -289,9 +289,7 @@ def send_email(
         )
         raise EmailNotDeliveredException
     except smtplib.SMTPException as e:
-        logger.exception(
-            "Error sending %s email to %s: %s", template, mail.to, str(e), stack_info=True
-        )
+        logger.exception("Error sending %s email to %s: %s", template, mail.to, e, stack_info=True)
         raise EmailNotDeliveredException
 
 
diff --git a/zerver/worker/queue_processors.py b/zerver/worker/queue_processors.py
index 5131de2792..9b0caa72e5 100644
--- a/zerver/worker/queue_processors.py
+++ b/zerver/worker/queue_processors.py
@@ -958,7 +958,7 @@ class EmbeddedBotWorker(QueueProcessingWorker):
                     bot_handler=self.get_bot_api_client(user_profile),
                 )
             except EmbeddedBotQuitException as e:
-                logging.warning(str(e))
+                logging.warning("%s", e)
 
 
 @assign_queue("deferred_work")
diff --git a/zproject/backends.py b/zproject/backends.py
index 6e9827b53c..f473a7a7c5 100644
--- a/zproject/backends.py
+++ b/zproject/backends.py
@@ -1822,12 +1822,12 @@ class SocialAuthMixin(ZulipAuthMixin, ExternalAuthMethod, BaseAuth):
             # the flow or the IdP is unreliable and returns a bad http response),
             # don't throw a 500, just send them back to the
             # login page and record the event at the info log level.
-            self.logger.info("%s: %s", type(e).__name__, str(e))
+            self.logger.info("%s: %s", type(e).__name__, e)
             return None
         except SocialAuthBaseException as e:
             # Other python-social-auth exceptions are likely
             # interesting enough that we should log a warning.
-            self.logger.warning(str(e))
+            self.logger.warning("%s", e)
             return None
 
     def should_auto_signup(self) -> bool: