diff --git a/docs/api/wuttamess.postfix.rst b/docs/api/wuttamess.postfix.rst
new file mode 100644
index 0000000..c5b9132
--- /dev/null
+++ b/docs/api/wuttamess.postfix.rst
@@ -0,0 +1,6 @@
+
+``wuttamess.postfix``
+=====================
+
+.. automodule:: wuttamess.postfix
+   :members:
diff --git a/docs/index.rst b/docs/index.rst
index 3869c2e..50e3061 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -31,4 +31,5 @@ project.
 
    api/wuttamess
    api/wuttamess.apt
+   api/wuttamess.postfix
    api/wuttamess.sync
diff --git a/src/wuttamess/postfix.py b/src/wuttamess/postfix.py
new file mode 100644
index 0000000..e5e9730
--- /dev/null
+++ b/src/wuttamess/postfix.py
@@ -0,0 +1,67 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  WuttaMess -- Fabric Automation Helpers
+#  Copyright © 2024 Lance Edgar
+#
+#  This file is part of Wutta Framework.
+#
+#  Wutta Framework is free software: you can redistribute it and/or modify it
+#  under the terms of the GNU General Public License as published by the Free
+#  Software Foundation, either version 3 of the License, or (at your option) any
+#  later version.
+#
+#  Wutta Framework is distributed in the hope that it will be useful, but
+#  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+#  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+#  more details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  Wutta Framework.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Postfix mail service
+"""
+
+
+def set_config(c, setting, value):
+    """
+    Configure the given setting with the given value.
+    """
+    c.run(f"postconf -e '{setting}={value}'")
+
+
+def set_myhostname(c, hostname):
+    """
+    Configure the ``myhostname`` setting with the given string.
+    """
+    set_config(c, 'myhostname', hostname)
+
+
+def set_myorigin(c, origin):
+    """
+    Configure the ``myorigin`` setting with the given string.
+    """
+    set_config(c, 'myorigin', origin)
+
+
+def set_mydestination(c, *destinations):
+    """
+    Configure the ``mydestinations`` setting with the given strings.
+    """
+    set_config(c, 'mydestination', ', '.join(destinations))
+
+
+def set_mynetworks(c, *networks):
+    """
+    Configure the ``mynetworks`` setting with the given strings.
+    """
+    set_config(c, 'mynetworks', ' '.join(networks))
+
+
+def set_relayhost(c, relayhost):
+    """
+    Configure the ``relayhost`` setting with the given string
+    """
+    set_config(c, 'relayhost', relayhost)
diff --git a/tests/test_postfix.py b/tests/test_postfix.py
new file mode 100644
index 0000000..1f75253
--- /dev/null
+++ b/tests/test_postfix.py
@@ -0,0 +1,54 @@
+# -*- coding: utf-8; -*-
+
+from unittest import TestCase
+from unittest.mock import MagicMock
+
+from wuttamess import postfix as mod
+
+
+class TestSetConfig(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        mod.set_config(c, 'foo', 'bar')
+        c.run.assert_called_once_with("postconf -e 'foo=bar'")
+
+
+class TestSetMyhostname(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        mod.set_myhostname(c, 'test.example.com')
+        c.run.assert_called_once_with("postconf -e 'myhostname=test.example.com'")
+
+
+class TestSetMyorigin(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        mod.set_myorigin(c, 'example.com')
+        c.run.assert_called_once_with("postconf -e 'myorigin=example.com'")
+
+
+class TestSetMydestination(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        mod.set_mydestination(c, 'example.com', 'test.example.com', 'localhost')
+        c.run.assert_called_once_with("postconf -e 'mydestination=example.com, test.example.com, localhost'")
+
+
+class TestSetMynetworks(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        mod.set_mynetworks(c, '127.0.0.0/8', '[::1]/128')
+        c.run.assert_called_once_with("postconf -e 'mynetworks=127.0.0.0/8 [::1]/128'")
+
+
+class TestSetRelayhost(TestCase):
+
+    def test_basic(self):
+        c = MagicMock()
+        mod.set_relayhost(c, 'mail.example.com')
+        c.run.assert_called_once_with("postconf -e 'relayhost=mail.example.com'")