diff --git a/docs/conf_base.py b/docs/conf_base.py
index 92997d6..affc125 100644
--- a/docs/conf_base.py
+++ b/docs/conf_base.py
@@ -50,8 +50,8 @@
 master_doc = 'index'
 
 # General information about the project.
-project = u'python-emails'
-copyright = u'2015-2026, Sergey Lavrinenko'
+project = 'python-emails'
+copyright = '2015-2026, Sergey Lavrinenko'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the
@@ -216,8 +216,8 @@
 # (source start file, target name, title,
 #  author, documentclass [howto, manual, or own class]).
 latex_documents = [
-  ('index', 'python-emails.tex', u'python-emails Documentation',
-   u'Sergey Lavrinenko', 'manual'),
+  ('index', 'python-emails.tex', 'python-emails Documentation',
+   'Sergey Lavrinenko', 'manual'),
 ]
 
 # The name of an image file (relative to this directory) to place at the top of
@@ -246,8 +246,8 @@
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    ('index', 'python-emails', u'python-emails Documentation',
-     [u'Sergey Lavrinenko'], 1)
+    ('index', 'python-emails', 'python-emails Documentation',
+     ['Sergey Lavrinenko'], 1)
 ]
 
 # If true, show URL addresses after external links.
@@ -260,8 +260,8 @@
 # (source start file, target name, title, author,
 #  dir menu entry, description, category)
 texinfo_documents = [
-  ('index', 'python-emails', u'python-emails Documentation',
-   u'Sergey Lavrinenko', 'python-emails', 'One line description of project.',
+  ('index', 'python-emails', 'python-emails Documentation',
+   'Sergey Lavrinenko', 'python-emails', 'One line description of project.',
    'Miscellaneous'),
 ]
 
diff --git a/emails/__init__.py b/emails/__init__.py
index 57e8a20..772c9de 100644
--- a/emails/__init__.py
+++ b/emails/__init__.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 """
 python-emails
 ~~~~~~~~~~~~~
diff --git a/emails/backend/__init__.py b/emails/backend/__init__.py
index c9b16aa..3952de5 100644
--- a/emails/backend/__init__.py
+++ b/emails/backend/__init__.py
@@ -1,3 +1,2 @@
-# encoding: utf-8
 from .factory import ObjectFactory
 from .smtp import SMTPBackend
diff --git a/emails/backend/factory.py b/emails/backend/factory.py
index fab0df0..17a712a 100644
--- a/emails/backend/factory.py
+++ b/emails/backend/factory.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 
 def simple_dict2str(d):
     # Simple dict serializer
diff --git a/emails/backend/inmemory/__init__.py b/emails/backend/inmemory/__init__.py
index 5f24697..9ff0c03 100644
--- a/emails/backend/inmemory/__init__.py
+++ b/emails/backend/inmemory/__init__.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 
 __all__ = ['InMemoryBackend', ]
 
diff --git a/emails/backend/response.py b/emails/backend/response.py
index dd10832..63748fd 100644
--- a/emails/backend/response.py
+++ b/emails/backend/response.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from __future__ import annotations
 
 from typing import Any
diff --git a/emails/backend/smtp/__init__.py b/emails/backend/smtp/__init__.py
index 5269652..9988a73 100644
--- a/emails/backend/smtp/__init__.py
+++ b/emails/backend/smtp/__init__.py
@@ -1,3 +1,2 @@
-# encoding: utf-8
 
 from .backend import SMTPBackend
\ No newline at end of file
diff --git a/emails/backend/smtp/backend.py b/emails/backend/smtp/backend.py
index 3f7231d..0b2500e 100644
--- a/emails/backend/smtp/backend.py
+++ b/emails/backend/smtp/backend.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from __future__ import annotations
 
 import logging
diff --git a/emails/backend/smtp/client.py b/emails/backend/smtp/client.py
index 3798c06..0aa59d7 100644
--- a/emails/backend/smtp/client.py
+++ b/emails/backend/smtp/client.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from __future__ import annotations
 
 __all__ = ['SMTPClientWithResponse', 'SMTPClientWithResponse_SSL']
diff --git a/emails/backend/smtp/exceptions.py b/emails/backend/smtp/exceptions.py
index a747aec..49e68c6 100644
--- a/emails/backend/smtp/exceptions.py
+++ b/emails/backend/smtp/exceptions.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import socket
 
 
diff --git a/emails/django/__init__.py b/emails/django/__init__.py
index 1594643..9bcf8c8 100644
--- a/emails/django/__init__.py
+++ b/emails/django/__init__.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from django.core.mail import get_connection
 from .. message import MessageTransformerMixin, MessageSignMixin, MessageBuildMixin, BaseMessage
 from .. utils import sanitize_email
diff --git a/emails/django_.py b/emails/django_.py
index cad8e6a..4534995 100644
--- a/emails/django_.py
+++ b/emails/django_.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import warnings
 warnings.warn("emails.django_ module moved to emails.django", DeprecationWarning)
 
diff --git a/emails/exc.py b/emails/exc.py
index 476b566..f091139 100644
--- a/emails/exc.py
+++ b/emails/exc.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from __future__ import annotations
 
 from .packages.dkim import DKIMException
diff --git a/emails/loader/__init__.py b/emails/loader/__init__.py
index eb8ca3a..de8eb3d 100644
--- a/emails/loader/__init__.py
+++ b/emails/loader/__init__.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import os.path
 from email.utils import formataddr
 
diff --git a/emails/loader/helpers.py b/emails/loader/helpers.py
index 7147417..c9f688e 100644
--- a/emails/loader/helpers.py
+++ b/emails/loader/helpers.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 __all__ = ['guess_charset', 'fix_content_type']
 from email.message import Message
 
diff --git a/emails/loader/local_store.py b/emails/loader/local_store.py
index 646f783..2c39bc5 100644
--- a/emails/loader/local_store.py
+++ b/emails/loader/local_store.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from email.utils import parseaddr
 import logging
 import mimetypes
diff --git a/emails/message.py b/emails/message.py
index 15c39fe..f2ce6a0 100644
--- a/emails/message.py
+++ b/emails/message.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 from __future__ import annotations
 
 from collections.abc import Callable
diff --git a/emails/signers.py b/emails/signers.py
index 71c8365..a3b77d4 100644
--- a/emails/signers.py
+++ b/emails/signers.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 # This module use pydkim for DKIM signature
 from __future__ import annotations
 
diff --git a/emails/store/file.py b/emails/store/file.py
index 1fbc0f5..5a2ff9a 100644
--- a/emails/store/file.py
+++ b/emails/store/file.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from __future__ import annotations
 
 import uuid
diff --git a/emails/store/store.py b/emails/store/store.py
index ae6e4c1..934657e 100644
--- a/emails/store/store.py
+++ b/emails/store/store.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from __future__ import annotations
 
 from collections import OrderedDict
diff --git a/emails/template/base.py b/emails/template/base.py
index 7b9976c..e521cdc 100644
--- a/emails/template/base.py
+++ b/emails/template/base.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import string
 
 
diff --git a/emails/template/jinja_template.py b/emails/template/jinja_template.py
index 8a31d88..51d608f 100644
--- a/emails/template/jinja_template.py
+++ b/emails/template/jinja_template.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from .base import BaseTemplate
 
 
diff --git a/emails/template/mako_template.py b/emails/template/mako_template.py
index c8b7208..9ac61a2 100644
--- a/emails/template/mako_template.py
+++ b/emails/template/mako_template.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from .base import BaseTemplate
 
 
diff --git a/emails/testsuite/conftest.py b/emails/testsuite/conftest.py
index 3fb2949..5269a51 100644
--- a/emails/testsuite/conftest.py
+++ b/emails/testsuite/conftest.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import logging
 import datetime
 import pytest
diff --git a/emails/testsuite/django_/test_django_integrations.py b/emails/testsuite/django_/test_django_integrations.py
index f8e43bb..006a64e 100644
--- a/emails/testsuite/django_/test_django_integrations.py
+++ b/emails/testsuite/django_/test_django_integrations.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import warnings
 import emails
 import emails.message
diff --git a/emails/testsuite/loader/test_helpers.py b/emails/testsuite/loader/test_helpers.py
index ab24b2a..44c222f 100644
--- a/emails/testsuite/loader/test_helpers.py
+++ b/emails/testsuite/loader/test_helpers.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 
 import logging; import  cssutils; cssutils.log.setLevel(logging.FATAL)
 
@@ -33,16 +32,16 @@ def norma_enc(enc):
         assert enc_
         return enc_
 
-    assert decode_text(u'A')[0] == u'A'
-    assert decode_text(b'A') == (u'A', 'ascii')
+    assert decode_text('A')[0] == 'A'
+    assert decode_text(b'A') == ('A', 'ascii')
 
     for enc in ['utf-8', 'windows-1251', 'cp866']:
-        t = u'Шла Саша по шоссе и сосала сушку. В огороде бузина, в Киеве дядька.'
+        t = 'Шла Саша по шоссе и сосала сушку. В огороде бузина, в Киеве дядька.'
         text, guessed_encoding = decode_text(t.encode(enc))
         print(text, norma_enc(guessed_encoding))
         assert (text, norma_enc(guessed_encoding)) == (t, norma_enc(enc))
 
-        html = u"""<html><meta http-equiv="Content-Type" content="text/html; charset=%s" />""" % enc
+        html = """<html><meta http-equiv="Content-Type" content="text/html; charset=%s" />""" % enc
         text, guessed_encoding = decode_text(html.encode('utf-8'), is_html=True)
         print(text, norma_enc(guessed_encoding))
         assert (text, norma_enc(guessed_encoding)) == (html, norma_enc(enc))
diff --git a/emails/testsuite/loader/test_loaders.py b/emails/testsuite/loader/test_loaders.py
index 958574a..6617721 100644
--- a/emails/testsuite/loader/test_loaders.py
+++ b/emails/testsuite/loader/test_loaders.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import os
 from lxml.etree import XMLSyntaxError
 import pytest
diff --git a/emails/testsuite/loader/test_rfc822_loader.py b/emails/testsuite/loader/test_rfc822_loader.py
index 5f5cb8b..988db09 100644
--- a/emails/testsuite/loader/test_rfc822_loader.py
+++ b/emails/testsuite/loader/test_rfc822_loader.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import glob
 import email
 import datetime
@@ -41,8 +40,8 @@ def test_msgloader():
 
     data = {'charset': 'utf-8',
             'subject': 'Что-то по-русски',
-            'mail_from': ('Максим Иванов', 'ivanov@ya.ru'),
-            'mail_to': [('Полина Сергеева', 'polina@mail.ru'), ('test', 'test@example.com')],
+            'mail_from': ('Максим Иванов', 'ivanov@ya.r'),
+            'mail_to': [('Полина Сергеева', 'polina@mail.r'), ('test', 'test@example.com')],
             'cc': [('CC User', 'cc@example.com'), ('cc', 'cc.1@example.com')],
             'html': '<h1>Привет!</h1><p>В первых строках...',
             'text': 'Привет!\nВ первых строках...',
diff --git a/emails/testsuite/message/__init__.py b/emails/testsuite/message/__init__.py
index bca5f67..e69de29 100644
--- a/emails/testsuite/message/__init__.py
+++ b/emails/testsuite/message/__init__.py
@@ -1 +0,0 @@
-# encoding: utf-8
diff --git a/emails/testsuite/message/helpers.py b/emails/testsuite/message/helpers.py
index 79b77b8..b942172 100644
--- a/emails/testsuite/message/helpers.py
+++ b/emails/testsuite/message/helpers.py
@@ -1,10 +1,9 @@
-# coding: utf-8
 import os
 
 import emails
 from emails.template import JinjaTemplate
 
-TO_EMAIL = os.environ.get('SMTP_TEST_MAIL_TO') or 'python.emails.test.2@yandex.ru'
+TO_EMAIL = os.environ.get('SMTP_TEST_MAIL_TO') or 'python.emails.test.2@yandex.r'
 FROM_EMAIL = os.environ.get('SMTP_TEST_MAIL_FROM') or 'python-emails@lavr.me'
 ROOT = os.path.dirname(__file__)
 
diff --git a/emails/testsuite/message/test_dkim.py b/emails/testsuite/message/test_dkim.py
index c3ea16f..e0b796f 100644
--- a/emails/testsuite/message/test_dkim.py
+++ b/emails/testsuite/message/test_dkim.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 import os
 import email
 import pytest
diff --git a/emails/testsuite/message/test_lazy_gettext.py b/emails/testsuite/message/test_lazy_gettext.py
index 0a77ebe..ac75afb 100644
--- a/emails/testsuite/message/test_lazy_gettext.py
+++ b/emails/testsuite/message/test_lazy_gettext.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import gettext
 from emails import Message
 from emails.utils import decode_header
diff --git a/emails/testsuite/message/test_message.py b/emails/testsuite/message/test_message.py
index 7f7f830..8a50fd7 100644
--- a/emails/testsuite/message/test_message.py
+++ b/emails/testsuite/message/test_message.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 import datetime
 from email.utils import parseaddr
 from dateutil.parser import parse as dateutil_parse
diff --git a/emails/testsuite/message/test_send.py b/emails/testsuite/message/test_send.py
index 6b70560..a7f00ee 100644
--- a/emails/testsuite/message/test_send.py
+++ b/emails/testsuite/message/test_send.py
@@ -1,4 +1,3 @@
-# coding: utf-8
 import time
 import random
 import pytest
@@ -18,7 +17,7 @@ def get_letters():
     yield emails.html(**data), None
 
     # Email with render
-    yield emails.html(**common_email_data(subject='Render with name=John')), {'name': u'John'}
+    yield emails.html(**common_email_data(subject='Render with name=John')), {'name': 'John'}
 
     # Email with several inline images
     url = 'http://lavr.github.io/python-emails/tests/campaignmonitor-samples/sample-template/template-widgets.html'
diff --git a/emails/testsuite/other/test_requests_encoding_detection.py b/emails/testsuite/other/test_requests_encoding_detection.py
deleted file mode 100644
index c384fd7..0000000
--- a/emails/testsuite/other/test_requests_encoding_detection.py
+++ /dev/null
@@ -1,29 +0,0 @@
-# encoding: utf-8
-import pytest
-import requests
-
-@pytest.mark.xfail
-def test_encoding_detection():
-
-    """
-    Broken encoding detection in requests 1.2.3. 
-    I'm failed to explain this bug importance to requests's team: 
-    https://github.com/kennethreitz/requests/issues/1604 
-    """
- 
-    url = 'http://lavr.github.io/python-emails/tests/requests/some-utf8-text.html'
-    expected_content = u'我需要单间。' # Chinese is for example only. Any other non-european encodings broken too.
-
-    r =	requests.get(url)
-
-    # Response.apparent_encoding is good
-    assert r.apparent_encoding == 'utf-8'
-    real_text = unicode(r.content, r.apparent_encoding)
-    assert expected_content in real_text
-
-    # but Response.text is broken
-    # (the reason is: commit a0ae2e6)
-    assert expected_content in r.text 
-
-if __name__=="__main__":
-   test_encoding_detection()
diff --git a/emails/testsuite/smtp/test_factory.py b/emails/testsuite/smtp/test_factory.py
index 0c3fd52..2b4692d 100644
--- a/emails/testsuite/smtp/test_factory.py
+++ b/emails/testsuite/smtp/test_factory.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import pytest
 from emails.backend.factory import ObjectFactory
 
diff --git a/emails/testsuite/smtp/test_smtp_backend.py b/emails/testsuite/smtp/test_smtp_backend.py
index 0331cc0..c258642 100644
--- a/emails/testsuite/smtp/test_smtp_backend.py
+++ b/emails/testsuite/smtp/test_smtp_backend.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 
 import socket
 
@@ -11,7 +10,7 @@
 SAMPLE_MESSAGE = {'html': '<p>Test from python-emails',
                   'text': 'Test from python-emails',
                   'mail_from': 's@lavr.me',
-                  'mail_to': 'sergei-nko@yandex.ru'}
+                  'mail_to': 'sergei-nko@yandex.r'}
 
 
 def test_send_to_unknown_host():
diff --git a/emails/testsuite/smtp/test_smtp_response.py b/emails/testsuite/smtp/test_smtp_response.py
index 47ddab3..8834836 100644
--- a/emails/testsuite/smtp/test_smtp_response.py
+++ b/emails/testsuite/smtp/test_smtp_response.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from emails.backend.response import SMTPResponse
 
 
diff --git a/emails/testsuite/smtp_servers.py b/emails/testsuite/smtp_servers.py
index 56c09d4..20201ba 100644
--- a/emails/testsuite/smtp_servers.py
+++ b/emails/testsuite/smtp_servers.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import os
 import platform
 import datetime
@@ -100,7 +99,7 @@ def patch_message(self, message):
         return message
 
     def __str__(self):
-        return u'SMTPTestParams({user}@{host}:{port})'.format(host=self.params.get('host'),
+        return 'SMTPTestParams({user}@{host}:{port})'.format(host=self.params.get('host'),
                                                               port=self.params.get('port'),
                                                               user=self.params.get('user', ''))
 
diff --git a/emails/testsuite/store/test_store.py b/emails/testsuite/store/test_store.py
index 462f113..c5596f2 100644
--- a/emails/testsuite/store/test_store.py
+++ b/emails/testsuite/store/test_store.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from io import BytesIO
 
 import pytest
diff --git a/emails/testsuite/test_templates.py b/emails/testsuite/test_templates.py
index dab2fb6..1dbb5ce 100644
--- a/emails/testsuite/test_templates.py
+++ b/emails/testsuite/test_templates.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import pytest
 from emails.template import MakoTemplate, StringTemplate, JinjaTemplate
 from emails.template.base import BaseTemplate
diff --git a/emails/testsuite/test_utils.py b/emails/testsuite/test_utils.py
index c61611a..8b5371d 100644
--- a/emails/testsuite/test_utils.py
+++ b/emails/testsuite/test_utils.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import pytest
 import datetime
 import time
diff --git a/emails/testsuite/transformer/test_parser.py b/emails/testsuite/transformer/test_parser.py
index 927bfb3..4a954ce 100644
--- a/emails/testsuite/transformer/test_parser.py
+++ b/emails/testsuite/transformer/test_parser.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from emails.transformer import HTMLParser
 
 
diff --git a/emails/testsuite/transformer/test_transformer.py b/emails/testsuite/transformer/test_transformer.py
index e70883e..5e82202 100644
--- a/emails/testsuite/transformer/test_transformer.py
+++ b/emails/testsuite/transformer/test_transformer.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 import os.path
 import emails.loader
 from emails.loader.local_store import FileSystemLoader, BaseLoader
diff --git a/emails/transformer.py b/emails/transformer.py
index f586be6..58918f6 100644
--- a/emails/transformer.py
+++ b/emails/transformer.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 
 import functools
 import logging
diff --git a/emails/utils.py b/emails/utils.py
index 78f5a3b..12e03a1 100644
--- a/emails/utils.py
+++ b/emails/utils.py
@@ -1,4 +1,3 @@
-# encoding: utf-8
 from __future__ import annotations
 
 import sys
@@ -207,7 +206,7 @@ def parse_name_and_email_list(elements: str | tuple[str | None, str] | list[Any]
 def parse_name_and_email(obj: str | tuple[str | None, str] | list[str],
                          encoding: str = 'utf-8') -> AddressPair:
     # In:  'john@smith.me' or  '"John Smith" <john@smith.me>' or ('John Smith', 'john@smith.me')
-    # Out: (u'John Smith', u'john@smith.me')
+    # Out: ('John Smith', 'john@smith.me')
 
     if isinstance(obj, (list, tuple)):
         if len(obj) == 2:
diff --git a/requirements/tests-base.txt b/requirements/tests-base.txt
index c38f487..d202133 100644
--- a/requirements/tests-base.txt
+++ b/requirements/tests-base.txt
@@ -4,4 +4,3 @@ speaklater
 pytest
 pytest-cov
 html5lib
-six
diff --git a/scripts/make_rfc822.py b/scripts/make_rfc822.py
index 7878ba4..02d2277 100755
--- a/scripts/make_rfc822.py
+++ b/scripts/make_rfc822.py
@@ -1,6 +1,4 @@
-#!/usr/bin/env python
-# coding: utf-8
-
+#!/usr/bin/env python3
 """
 
 Simple utility that imports html from url ang print generated rfc822 message to console.
@@ -65,7 +63,7 @@ def _get_message(self):
         args = dict(images_inline=options.inline_images,
                     message_params=dict(headers=self._headers_from_command_line(),
                                         mail_from=(options.from_name, options.from_email),
-                                        subject=T(unicode(options.subject, 'utf-8')),
+                                        subject=T(options.subject),
                                         message_id=message_id),
                     template_cls=T)
         if options.url:
diff --git a/setup.py b/setup.py
index f73614b..6ffea53 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
 """
 
 python-emails