diff --git a/scrapy/mail.py b/scrapy/mail.py
index 1e65b1623..ce7beb773 100644
--- a/scrapy/mail.py
+++ b/scrapy/mail.py
@@ -16,10 +16,8 @@ from email.utils import formatdate
 from io import BytesIO
 from typing import IO, TYPE_CHECKING, Any
 
-from twisted import version as twisted_version
 from twisted.internet import ssl
 from twisted.internet.defer import Deferred
-from twisted.python.versions import Version
 
 from scrapy.utils.misc import arg_to_iter
 from scrapy.utils.python import to_bytes
@@ -217,12 +215,9 @@ class MailSender:
             "heloFallback": True,
             "requireAuthentication": False,
             "requireTransportSecurity": self.smtptls,
+            "hostname": self.smtphost,
         }
 
-        # Newer versions of twisted require the hostname to use STARTTLS
-        if twisted_version >= Version("twisted", 21, 2, 0):
-            factory_keywords["hostname"] = self.smtphost
-
         factory = ESMTPSenderFactory(
             self.smtpuser,
             self.smtppass,
diff --git a/tests/test_mail.py b/tests/test_mail.py
index ff1505397..c6af2b1b8 100644
--- a/tests/test_mail.py
+++ b/tests/test_mail.py
@@ -2,11 +2,8 @@ import unittest
 from email.charset import Charset
 from io import BytesIO
 
-from twisted import version as twisted_version
 from twisted.internet import defer
 from twisted.internet._sslverify import ClientTLSOptions
-from twisted.internet.ssl import ClientContextFactory
-from twisted.python.versions import Version
 
 from scrapy.mail import MailSender
 
@@ -159,10 +156,7 @@ class MailSenderTest(unittest.TestCase):
         )
 
         context = factory.buildProtocol("test@scrapy.org").context
-        if twisted_version >= Version("twisted", 21, 2, 0):
-            self.assertIsInstance(context, ClientTLSOptions)
-        else:
-            self.assertIsInstance(context, ClientContextFactory)
+        self.assertIsInstance(context, ClientTLSOptions)
 
 
 if __name__ == "__main__":