Restore SMTP integration tests using Mailpit

- Mark SMTP-dependent tests with @pytest.mark.e2e
- Split CI into two jobs: unit tests (all Python versions, no mail
  server) and e2e tests (Python 3.14, with Mailpit)
- Replace the removed lavr/docker-postfix with axllent/mailpit
- Keep test_send_letters out of e2e to avoid external HTTP deps;
  add test_send_simple for basic SMTP verification instead

Fixes #185

Author: lavr

.github/workflows/tests.yaml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   tests:
-    name: ${{ matrix.name }}
+    name: "unit / ${{ matrix.name }}"
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -34,10 +34,42 @@ jobs:
           pip install -U setuptools
           python -m pip install -U pip
       - run: pip install tox
-      - name: run rests
+      - name: run tests
+        run: tox -e ${{ matrix.tox }} -- -m "not e2e"
+
+  e2e:
+    name: "e2e / ${{ matrix.name }}"
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - {name: '3.14', python: '3.14', os: ubuntu-latest, tox: py314}
+    services:
+      mailpit:
+        image: axllent/mailpit
+        ports:
+          - 1025:1025
+          - 8025:8025
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python }}
+          cache: pip
+      - name: update pip
+        run: |
+          pip install -U wheel
+          pip install -U setuptools
+          python -m pip install -U pip
+      - run: pip install tox
+      - name: run e2e tests
         env:
           SMTP_TEST_SUBJECT_SUFFIX: "github-actions sha:${{ github.sha }} run_id:${{ github.run_id }}"
           SMTP_TEST_MAIL_FROM: python-emails-tests@lavr.me
           SMTP_TEST_MAIL_TO: python-emails-tests@lavr.me
-          SMTP_TEST_SETS: ""
-        run: tox -e ${{ matrix.tox }}
+          SMTP_TEST_SETS: LOCAL
+          SMTP_TEST_LOCAL_HOST: 127.0.0.1
+          SMTP_TEST_LOCAL_PORT: 1025
+          SMTP_TEST_LOCAL_WITHOUT_TLS: true
+        run: tox -e ${{ matrix.tox }} -- -m e2e

emails/testsuite/message/test_send.py

@@ -2,6 +2,7 @@
 from __future__ import unicode_literals
 import time
 import random
+import pytest
 import emails
 import emails.loader
 from emails.backend.smtp import SMTPBackend
@@ -41,6 +42,16 @@ def test_send_letters():
             # server.sleep()
 
 
+@pytest.mark.e2e
+def test_send_simple():
+    message = emails.html(**common_email_data(subject='Simple e2e test'))
+    for tag, server in get_servers():
+        server.patch_message(message)
+        response = message.send(smtp=server.params)
+        assert response.success
+
+
+@pytest.mark.e2e
 def test_send_with_context_manager():
     for _, server in get_servers():
         b = SMTPBackend(**server.params)

emails/testsuite/smtp/test_smtp_backend.py

@@ -26,6 +26,7 @@ def test_send_to_unknown_host():
     assert response.error.errno == socket.EAI_NONAME
 
 
+@pytest.mark.e2e
 def test_smtp_send_with_reconnect():
     """
     Check SMTPBackend.sendmail reconnect

setup.cfg

@@ -3,3 +3,5 @@ universal=1
 
 [tool:pytest]
 norecursedirs = .* {arch} *.egg *.egg-info dist build requirements
+markers =
+    e2e: tests that require a running SMTP server