diff --git a/aiosmtpd/docs/NEWS.rst b/aiosmtpd/docs/NEWS.rst
index bf31b61..0962d67 100644
--- a/aiosmtpd/docs/NEWS.rst
+++ b/aiosmtpd/docs/NEWS.rst
@@ -26,6 +26,15 @@ Fixed/Improved
   This is the correct, strict interpretation of :rfc:`4954` mentions about ``=``
 
 
+1.2.4 (aiosmtpd-next)
+=====================
+
+Added
+-----
+* New :meth:`handle_EHLO` interaction where said method can now modify list of responses
+  to the EHLO command (Closes #155)
+
+
 1.2.3 (2021-01-14)
 ==================
 
diff --git a/aiosmtpd/docs/handlers.rst b/aiosmtpd/docs/handlers.rst
index 7f45007..10d2331 100644
--- a/aiosmtpd/docs/handlers.rst
+++ b/aiosmtpd/docs/handlers.rst
@@ -34,16 +34,19 @@ Handler hooks
 =============
 
 Handlers can implement hooks that get called during the SMTP dialog, or in
-exceptional cases.  These *handler hooks* are all called asynchronously
+exceptional cases.  These *handler hooks* are all called **asynchronously**
 (i.e. they are coroutines) and they *must* return a status string, such as
 ``'250 OK'``.  All handler hooks are optional and default behaviors are
 carried out by the ``SMTP`` class when a hook is omitted, so you only need to
 implement the ones you care about.  When a handler hook is defined, it may
 have additional responsibilities as described below.
 
-All handler hooks take at least three arguments, the ``SMTP`` server instance,
-:ref:`a session instance, and an envelope instance <sessions_and_envelopes>`.
-Some methods take additional arguments.
+All handler hooks will be called with at least three arguments:
+(1) the ``SMTP`` server instance,
+(2) :ref:`a session instance <sessions_and_envelopes>`, and
+(3) :ref:`an envelope instance <sessions_and_envelopes>`.
+
+Some handler hooks will receive additional arguments.
 
 The following hooks are currently defined:
 
@@ -54,14 +57,40 @@ The following hooks are currently defined:
     also set the ``session.host_name`` attribute before returning
     ``'250 {}'.format(server.hostname)`` as the status.
 
+    .. important::
+
+        If the handler sets the ``session.host_name`` attribute to a false-y value
+        (or leave it as the default ``None`` value)
+        it will signal later steps that ``HELO`` failed
+        and need to be performed again.
+
+        This also applies to the :meth:`handle_EHLO` hook below.
+
 .. py:method:: handle_EHLO(server, session, envelope, hostname)
+               handle_EHLO(server, session, envelope, hostname, responses)
 
     Called during ``EHLO``.  The ``hostname`` argument is the host name given
-    by the client in the ``EHLO`` command.  If implemented, this hook must
-    also set the ``session.host_name`` attribute.  This hook may push
-    additional ``250-<command>`` responses to the client by yielding from
-    ``server.push(status)`` before returning ``250 HELP`` as the final
-    response.
+    by the client in the ``EHLO`` command.
+
+    There are two implementation forms.
+
+    The first form accepts only 4 (four) arguments.
+    This hook may push *additional* ``250-<command>`` responses to the client by doing
+    ``await server.push(status)`` before returning ``"250 HELP"`` as the final response.
+
+    **The 4-argument form will be deprecated in version 2.0**
+
+    The second form accept 5 (five) arguments.
+    ``responses`` is a list strings representing the 'planned' responses to the ``EHLO`` command,
+    *including* the last ``250 HELP`` response.
+    The hook must return a list containing the desired responses.
+    *This is the only exception to the requirement of returning a status string.*
+
+    .. important::
+
+        It is strongly recommended to not change element ``[0]`` of the list
+        (containing the hostname of the SMTP server),
+        and to end the list with ``"250 HELP"``
 
 .. py:method:: handle_NOOP(server, session, envelope, arg)
 
@@ -89,7 +118,7 @@ The following hooks are currently defined:
 
     Called during ``RCPT TO``.  The ``address`` argument is the parsed email
     address given by the client in the ``RCPT TO`` command, and
-    ``rcpt_options`` are any additional ESMTP recipient options providing by
+    ``rcpt_options`` are any additional ESMTP recipient options provided by
     the client.  If implemented, this hook should append the address to
     ``envelope.rcpt_tos`` and may extend ``envelope.rcpt_options`` (both of
     which are always Python lists).
@@ -126,7 +155,7 @@ The following hooks are currently defined:
 
 In addition to the SMTP command hooks, the following hooks can also be
 implemented by handlers.  These have different APIs, and are called
-synchronously (i.e. they are **not** coroutines).
+**synchronously** (i.e. they are **not** coroutines).
 
 .. py:method:: handle_STARTTLS(server, session, envelope)
 
@@ -142,7 +171,10 @@ synchronously (i.e. they are **not** coroutines).
     a status string, such as ``'542 Internal server error'``.  If the method
     returns ``None`` or raises an exception, an exception will be logged, and a
     ``451`` code will be returned to the client.
-    **Note:** If client connection losted function will not be called.
+
+    .. important::
+
+        If client connection is lost, this handler will NOT be called.
 
 
 .. _auth_hooks:
diff --git a/aiosmtpd/smtp.py b/aiosmtpd/smtp.py
index ab8a866..3e3f8c7 100644
--- a/aiosmtpd/smtp.py
+++ b/aiosmtpd/smtp.py
@@ -65,7 +65,7 @@ __all__ = [
     "AuthMechanismType",
     "MISSING",
 ]  # Will be added to by @public
-__version__ = '1.3.0.a1'
+__version__ = '1.3.0a2'
 __ident__ = 'Python SMTP {}'.format(__version__)
 log = logging.getLogger('mail.log')
 
@@ -270,6 +270,7 @@ class SMTP(asyncio.StreamReaderProtocol):
         self._auth_require_tls = auth_require_tls
         self._auth_callback = auth_callback or login_always_fail
         self._auth_required = auth_required
+
         # Get hooks & methods to significantly speedup getattr's
         self._auth_methods: Dict[str, _AuthMechAttr] = {
             getattr(
@@ -294,6 +295,26 @@ class SMTP(asyncio.StreamReaderProtocol):
             for m in dir(handler)
             if m.startswith("handle_")
         }
+
+        # When we've deprecated the 4-arg form of handle_EHLO,
+        # we can -- and should -- remove this whole code block
+        ehlo_hook = self._handle_hooks.get("EHLO", None)
+        if ehlo_hook is None:
+            self._ehlo_hook_ver = None
+        else:
+            ehlo_hook_params = inspect.signature(ehlo_hook).parameters
+            if len(ehlo_hook_params) == 4:
+                self._ehlo_hook_ver = "old"
+                warn("Use the 5-argument handle_EHLO() hook instead of "
+                     "the 4-argument handle_EHLO() hook; "
+                     "support for the 4-argument handle_EHLO() hook will be "
+                     "removed in version 2.0",
+                     DeprecationWarning)
+            elif len(ehlo_hook_params) == 5:
+                self._ehlo_hook_ver = "new"
+            else:
+                raise RuntimeError("Unsupported EHLO Hook")
+
         self._smtp_methods: Dict[str, Any] = {
             m.replace("smtp_", ""): getattr(self, m)
             for m in dir(self)
@@ -636,32 +657,50 @@ class SMTP(asyncio.StreamReaderProtocol):
         if not hostname:
             await self.push('501 Syntax: EHLO hostname')
             return
+
+        response = []
         self._set_rset_state()
         self.session.extended_smtp = True
-        await self.push('250-%s' % self.hostname)
+        response.append('250-%s' % self.hostname)
         if self.data_size_limit:
-            await self.push('250-SIZE %s' % self.data_size_limit)
+            response.append('250-SIZE %s' % self.data_size_limit)
             self.command_size_limits['MAIL'] += 26
         if not self._decode_data:
-            await self.push('250-8BITMIME')
+            response.append('250-8BITMIME')
         if self.enable_SMTPUTF8:
-            await self.push('250-SMTPUTF8')
+            response.append('250-SMTPUTF8')
             self.command_size_limits['MAIL'] += 10
         if self.tls_context and not self._tls_protocol:
-            await self.push('250-STARTTLS')
+            response.append('250-STARTTLS')
+        if not self._auth_require_tls or self._tls_protocol:
+            response.append(
+                "250-AUTH " + " ".join(sorted(self._auth_methods.keys()))
+            )
+
         if hasattr(self, 'ehlo_hook'):
             warn('Use handler.handle_EHLO() instead of .ehlo_hook()',
                  DeprecationWarning)
             await self.ehlo_hook()
-        if not self._auth_require_tls or self._tls_protocol:
-            await self.push(
-                "250-AUTH " + " ".join(sorted(self._auth_methods.keys()))
-            )
-        status = await self._call_handler_hook('EHLO', hostname)
-        if status is MISSING:
+
+        if self._ehlo_hook_ver is None:
             self.session.host_name = hostname
-            status = '250 HELP'
-        await self.push(status)
+            response.append('250 HELP')
+        elif self._ehlo_hook_ver == "old":
+            # Old behavior: Send all responses first...
+            for r in response:
+                await self.push(r)
+            # ... then send the response from the hook.
+            response = [await self._call_handler_hook("EHLO", hostname)]
+            # (The hook might internally send its own responses.)
+        elif self._ehlo_hook_ver == "new":  # pragma: nobranch
+            # New behavior: hand over list of responses so far to the hook, and
+            # REPLACE existing list of responses with what the hook returns.
+            # We will handle the push()ing
+            response.append('250 HELP')
+            response = await self._call_handler_hook("EHLO", hostname, response)
+
+        for r in response:
+            await self.push(r)
 
     @syntax('NOOP [ignored]')
     async def smtp_NOOP(self, arg):
diff --git a/conf.py b/conf.py
index 3968c70..b4a888c 100644
--- a/conf.py
+++ b/conf.py
@@ -13,23 +13,41 @@
 # serve to show the default.
 
 import sys
-import os
 import re
 import datetime
 
 from pathlib import Path
 
-RE__VERSION = re.compile(r"""__version__ = (['"])(?P<ver>[^'"]+)(\1)""")
+try:
+    # noinspection PyPackageRequirements
+    from colorama import (
+        Fore,
+        Style,
+        init as colorama_init,
+    )
+    colorama_init()
+except ImportError:
+    class Fore:
+        CYAN = "\x1b[1;96m"
+        GREEN = "\x1b[1;92m"
+        YELLOW = "\x1b[1;93m"
+
+    class Style:
+        BRIGHT = "\x1b[1m"
+        RESET_ALL = "\x1b[0m"
 
-YELLOW = "\x1b[1;93m"
-NORM = "\x1b[0m"
+    colorama_init = None
+
+
+RE__VERSION = re.compile(r"""__version__ = (['"])(?P<ver>[^'"]+)(\1)""")
 
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-sys.path.insert(0, os.path.abspath('.'))
-sys.path.append(str(Path("aiosmtpd/docs/_exts").expanduser().absolute()))
+_curdir = Path(".").expanduser().absolute()
+sys.path.insert(0, str(_curdir))
+sys.path.append(str(_curdir / "aiosmtpd" / "docs" / "_exts"))
 
 # -- General configuration ------------------------------------------------
 
@@ -300,17 +318,16 @@ def setup(app):
 
 def index_html():
     import errno
-    cwd = os.getcwd()
+    cwd = Path(".").expanduser().absolute()
+    htmldir = cwd / "build" / "sphinx" / "html"
     try:
         try:
-            os.makedirs('build/sphinx/html')
-        except OSError as error:
-            if error.errno != errno.EEXIST:
-                raise
-        os.chdir('build/sphinx/html')
+            htmldir.mkdir()
+        except FileExistsError:
+            pass
         try:
-            os.symlink('README.html', 'index.html')
-            print('index.html -> README.html')
+            (htmldir / "index.html").symlink_to("README.html")
+            print(f'{Fore.CYAN}index.html -> README.html')
         except OSError as error:
             # On Windows>= 7, only users with 'SeCreateSymbolicLinkPrivilege' token
             # can create symlinks.
@@ -318,14 +335,14 @@ def index_html():
                     or str(error) == "symbolic link privilege not held"):
                 # I don't like matching against string, but sometimes this particular
                 # OSError does not have any errno nor winerror.
-                print(f"{YELLOW}WARNING: No privilege to create symlinks. "
-                      f"You have to make one manually{NORM}")
+                print(f"{Fore.YELLOW}WARNING: No privilege to create symlinks. "
+                      f"You have to make one manually")
             elif error.errno == errno.EEXIST:
                 pass
             else:
                 raise
     finally:
-        os.chdir(cwd)
+        print(Style.RESET_ALL)
 
 
 import atexit
diff --git a/tox.ini b/tox.ini
index 8e46bd9..e481a11 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,4 +1,5 @@
 [tox]
+minversion = 3.9.0
 envlist = qa, docs, py{36,37,38,39}-{nocov,cov,diffcov}
 skip_missing_interpreters = True
 
@@ -25,7 +26,7 @@ deps =
     colorama
     coverage[toml]
     packaging
-    pytest
+    pytest >= 6.0  # Require >= 6.0 for pyproject.toml support (PEP 517)
     pytest-cov
     pytest-mock
     pytest-profiling
@@ -45,7 +46,7 @@ setenv =
     !py36: PY_36=gt
     py39: PY_39=ge
     !py39: PY_39=lt
-    PLATFORM={env:PLATFORM:linux}
+    PLATFORM={env:PLATFORM:posix}
 passenv =
     PYTHON*
     TRAVIS
@@ -78,8 +79,10 @@ commands =
 deps:
     {[qadocs]deps}
 
+# I'd love to fold flake8 into pyproject.toml, because the flake8 settings
+# should be "project-wide" settings (enforced not only during tox).
+# But the flake8 maintainers seem to harbor a severe dislike of pyproject.toml.
 [flake8]
-exclude = conf.py
 jobs = 1
 max-line-length = 88
 ignore = E123, E133, W503, W504

diff --git a/.github/workflows/unit-testing-and-coverage.yml b/.github/workflows/unit-testing-and-coverage.yml
index d3de80b..252af1e 100644
--- a/.github/workflows/unit-testing-and-coverage.yml
+++ b/.github/workflows/unit-testing-and-coverage.yml
@@ -4,9 +4,15 @@ on:
   # This is for direct commit to master
   push:
     branches: [ "master" ]
+    paths:
+      - "aiosmtpd/*"
+      - "setup.cfg"  # To monitor changes in dependencies
   # This is for PRs
   pull_request:
     branches: [ "master" ]
+    paths:
+      - "aiosmtpd/*"
+      - "setup.cfg"  # To monitor changes in dependencies
   # Manual/on-demand
   workflow_dispatch:
   # When doing "releases"
@@ -14,20 +20,37 @@ on:
     types: [ "created", "edited", "published", "prereleased", "released" ]
 
 jobs:
-  test:
+  qa_docs:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: "Checkout latest commit"
+        uses: actions/checkout@v2
+      - name: "Set up Python 3.8"
+        uses: actions/setup-python@v2
+        with:
+          python-version: 3.8
+      - name: "Install dependencies"
+        run: |
+          python -m pip install --upgrade pip
+          pip install tox
+      - name: "Execute tox -e qa,docs"
+        run: |
+          tox -e qa,docs
+  testing:
+    needs: qa_docs
     strategy:
       # If a matrix fail, do NOT stop other matrix, let them run to completion
       fail-fast: false
       matrix:
-        os: [ "ubuntu-latest" ]
-        platform: [ "linux" ]
+        os: [ "ubuntu-18.04", "ubuntu-20.04", "macos-10.15" ]
+        platform: [ "posix" ]
         python-version: [ "3.6", "3.7", "3.8", "3.9", "pypy3" ]
         include:
           - os: "windows-latest"
             platform: "mswin"
-            # Only the latest stable branch as indicated on
+            # Only the latest frozen branch as indicated on
             # https://devguide.python.org/#branchstatus
-            # ('stable' means Status == "security")
+            # ('frozen' means Status == "security")
             # Reason being that Windows users can change their Python anytime,
             # so there is no benefit in testing all released Python versions.
             # Plus pypy3 implementation in Windows is ... complicated. We
@@ -53,7 +76,7 @@ jobs:
       # "py" testenv means we'll use whatever Python provided by GA,
       # as specified in 'matrix' above. No need to specify exact version.
       run: |
-        tox -e "qa,docs,py-cov"
+        tox -e py-cov
     - name: "Report to codecov"
       # Ubuntu 18.04 came out of the box with 3.6, and LOTS of system are still running
       # 18.04 happily, so we choose this as the 'canonical' code coverage testing.
diff --git a/aiosmtpd/tests/test_handlers.py b/aiosmtpd/tests/test_handlers.py
index 3463d35..f20028d 100644
--- a/aiosmtpd/tests/test_handlers.py
+++ b/aiosmtpd/tests/test_handlers.py
@@ -14,7 +14,7 @@ from mailbox import Maildir
 from operator import itemgetter
 from smtplib import SMTP, SMTPDataError, SMTPRecipientsRefused
 from tempfile import TemporaryDirectory
-from unittest.mock import call, patch
+from unittest.mock import call, patch, Mock
 
 
 CRLF = '\r\n'
@@ -534,11 +534,40 @@ class HELOHandler:
         return '250 geddy.example.com'
 
 
-class EHLOHandler:
+class EHLOHandlerDeprecated:
+    hostname = None
+
     async def handle_EHLO(self, server, session, envelope, hostname):
+        self.hostname = hostname
         return '250 alex.example.com'
 
 
+class EHLOHandlerNew:
+    hostname = None
+    orig_responses = []
+
+    def __init__(self, *features):
+        self.features = features
+
+    async def handle_EHLO(self, server, session, envelope, hostname, responses):
+        self.hostname = hostname
+        self.orig_responses.extend(responses)
+        my_resp = [responses[0]]
+        my_resp.extend(f"250-{f}" for f in self.features)
+        my_resp.append("250 HELP")
+        return my_resp
+
+
+class EHLOHandlerIncompatibleShort:
+    async def handle_EHLO(self, server, session, envelope):
+        return
+
+
+class EHLOHandlerIncompatibleLong:
+    async def handle_EHLO(self, server, session, envelope, hostname, responses, xtra):
+        return
+
+
 class MAILHandler:
     async def handle_MAIL(self, server, session, envelope, address, options):
         envelope.mail_options.extend(options)
@@ -595,16 +624,56 @@ Subject: Test
         self.assertEqual(code, 250)
         self.assertEqual(response, b'geddy.example.com')
 
-    def test_ehlo_hook(self):
-        controller = Controller(EHLOHandler())
+    def test_ehlo_hook_oldsystem(self):
+        declare_myself = "me"
+        handler = EHLOHandlerDeprecated()
+        controller = Controller(handler)
         controller.start()
         self.addCleanup(controller.stop)
         with SMTP(controller.hostname, controller.port) as client:
-            code, response = client.ehlo('me')
+            code, response = client.ehlo(declare_myself)
         self.assertEqual(code, 250)
+        self.assertEqual(declare_myself, handler.hostname)
         lines = response.decode('utf-8').splitlines()
         self.assertEqual(lines[-1], 'alex.example.com')
 
+    def test_ehlo_hook_newsystem(self):
+        declare_myself = "me"
+        handler = EHLOHandlerNew("FEATURE1", "FEATURE2 OPTION", "FEAT3 OPTA OPTB")
+        controller = Controller(handler)
+        controller.start()
+        self.addCleanup(controller.stop)
+        with SMTP(controller.hostname, controller.port) as client:
+            code, response = client.ehlo(declare_myself)
+        self.assertEqual(code, 250)
+        self.assertEqual(declare_myself, handler.hostname)
+
+        self.assertIn("250-8BITMIME", handler.orig_responses)
+        self.assertIn("250-SMTPUTF8", handler.orig_responses)
+        self.assertNotIn("8bitmime", client.esmtp_features)
+        self.assertNotIn("smtputf8", client.esmtp_features)
+
+        self.assertIn("feature1", client.esmtp_features)
+        self.assertIn("feature2", client.esmtp_features)
+        self.assertEqual("OPTION", client.esmtp_features["feature2"])
+        self.assertIn("feat3", client.esmtp_features)
+        self.assertEqual("OPTA OPTB", client.esmtp_features["feat3"])
+        self.assertIn("help", client.esmtp_features)
+
+    def test_ehlo_hook_incompat_short(self):
+        handler = EHLOHandlerIncompatibleShort()
+        controller = Controller(handler)
+        self.addCleanup(controller.stop)
+        with self.assertRaises(RuntimeError):
+            controller.start()
+
+    def test_ehlo_hook_incompat_long(self):
+        handler = EHLOHandlerIncompatibleLong()
+        controller = Controller(handler)
+        self.addCleanup(controller.stop)
+        with self.assertRaises(RuntimeError):
+            controller.start()
+
     def test_mail_hook(self):
         controller = Controller(MAILHandler())
         controller.start()
@@ -782,3 +851,15 @@ Testing
             controller.smtpd.warnings[0],
             call('Use handler.handle_RSET() instead of .rset_hook()',
                  DeprecationWarning))
+
+    @patch("aiosmtpd.smtp.warn")
+    def test_handle_ehlo_4arg_deprecation(self, mock_warn: Mock):
+        handler = EHLOHandlerDeprecated()
+        _ = Server(handler)
+        mock_warn.assert_called_with(
+            "Use the 5-argument handle_EHLO() hook instead of "
+            "the 4-argument handle_EHLO() hook; "
+            "support for the 4-argument handle_EHLO() hook will be "
+            "removed in version 2.0",
+            DeprecationWarning
+        )
diff --git a/aiosmtpd/tests/test_smtp.py b/aiosmtpd/tests/test_smtp.py
index d682dc1..966c5fa 100644
--- a/aiosmtpd/tests/test_smtp.py
+++ b/aiosmtpd/tests/test_smtp.py
@@ -435,16 +435,17 @@ class TestSMTP(unittest.TestCase):
         with SMTP(*self.address) as client:
             code, response = client.ehlo('example.com')
             self.assertEqual(code, 250)
-            lines = response.splitlines()
-            expecteds = (
+            actuals = response.splitlines()
+            expecteds = [
                 bytes(socket.getfqdn(), 'utf-8'),
                 b'SIZE 33554432',
                 b'SMTPUTF8',
                 b'AUTH LOGIN PLAIN',
                 b'HELP',
-            )
-            for actual, expected in zip(lines, expecteds):
-                self.assertEqual(actual, expected)
+            ]
+            # for actual, expected in zip(lines, expecteds):
+            #     self.assertEqual(actual, expected)
+            self.assertEqual(expecteds, actuals)
 
     def test_ehlo_duplicate(self):
         with SMTP(*self.address) as client:

EHLO command returns all bunch of 250- data, even when the hooks returns otherwise
[In the current state of the code](https://github.com/aio-libs/aiosmtpd/blob/master/aiosmtpd/smtp.py#L351), some data are pushed BEFORE calling the hook, including

```
    250-{hostname}
    250-SIZE ...
    250-8BITMIME
    250-SMTPUTF8
    250-STARTTLS
```

And AFTER that, the hook is called.

The issue is that if the hook doesn't return a 2xx response, the server sends a mixed response and makes the clients fails.

The `EHLO` command should call the hook, and depending on the response, send all the push commands afterward.

aiosmtpd/tests/test_handlers.py::TestHooks::test_ehlo_hook_incompat_long aiosmtpd/tests/test_handlers.py::TestHooks::test_ehlo_hook_incompat_short aiosmtpd/tests/test_handlers.py::TestHooks::test_ehlo_hook_newsystem aiosmtpd/tests/test_handlers.py::TestDeprecation::test_handle_ehlo_4arg_deprecation
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