diff --git a/pyquarantine/__init__.py b/pyquarantine/__init__.py
index ffe3b17..668121a 100644
--- a/pyquarantine/__init__.py
+++ b/pyquarantine/__init__.py
@@ -40,7 +40,7 @@ from copy import copy
 from email import message_from_binary_file
 from email.header import Header, decode_header, make_header
 from email.headerregistry import AddressHeader, _default_header_map
-from email.policy import SMTPUTF8
+from email.policy import SMTP
 from io import BytesIO
 from netaddr import IPNetwork, AddrFormatError
 
@@ -297,7 +297,7 @@ class QuarantineMilter(Milter.Base):
             # is read/modified by actions
             self.fp.seek(0)
             self.msg = message_from_binary_file(
-                self.fp, _class=MilterMessage, policy=SMTPUTF8.clone(
+                self.fp, _class=MilterMessage, policy=SMTP.clone(
                     refold_source='none'))
             self.msginfo = {
                 "mailfrom": self.mailfrom,
diff --git a/pyquarantine/modify.py b/pyquarantine/modify.py
index c04a3a8..cee04fc 100644
--- a/pyquarantine/modify.py
+++ b/pyquarantine/modify.py
@@ -28,7 +28,7 @@ from bs4 import BeautifulSoup
 from collections import defaultdict
 from copy import copy
 from email.message import MIMEPart
-from email.policy import SMTPUTF8
+from email.policy import SMTP
 from html import escape
 from urllib.parse import quote
 
@@ -203,7 +203,7 @@ def _inject_body(milter):
 
 
 def _wrap_message(milter):
-    attachment = MIMEPart(policy=SMTPUTF8)
+    attachment = MIMEPart(policy=SMTP)
     attachment.set_content(milter.msg_as_bytes(),
                            maintype="plain", subtype="text",
                            disposition="attachment",
diff --git a/pyquarantine/storage.py b/pyquarantine/storage.py
index 2dae497..178f458 100644
--- a/pyquarantine/storage.py
+++ b/pyquarantine/storage.py
@@ -25,7 +25,7 @@ import os
 from calendar import timegm
 from datetime import datetime
 from email import message_from_bytes
-from email.policy import SMTPUTF8
+from email.policy import SMTP
 from glob import glob
 from time import gmtime
 
@@ -362,7 +362,7 @@ class FileMailStorage(BaseMailStorage):
         msg = message_from_bytes(
             self.get_mail_bytes(storage_id),
             _class=MilterMessage,
-            policy=SMTPUTF8.clone(refold_source='none'))
+            policy=SMTP.clone(refold_source='none'))
         return (metadata, msg)