diff --git a/poetry.lock b/poetry.lock
index ce41273..4b32b94 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -13,13 +13,13 @@ files = [
 
 [[package]]
 name = "anyio"
-version = "4.2.0"
+version = "3.7.1"
 description = "High level compatibility layer for multiple asynchronous event loop implementations"
 optional = false
-python-versions = ">=3.8"
+python-versions = ">=3.7"
 files = [
-    {file = "anyio-4.2.0-py3-none-any.whl", hash = "sha256:745843b39e829e108e518c489b31dc757de7d2131d53fac32bd8df268227bfee"},
-    {file = "anyio-4.2.0.tar.gz", hash = "sha256:e1875bb4b4e2de1669f4bc7869b6d3f54231cdced71605e6e64c9be77e3be50f"},
+    {file = "anyio-3.7.1-py3-none-any.whl", hash = "sha256:91dee416e570e92c64041bd18b900d1d6fa78dff7048769ce5ac5ddad004fbb5"},
+    {file = "anyio-3.7.1.tar.gz", hash = "sha256:44a3c9aba0f5defa43261a8b3efb97891f2bd7d804e0e1f56419befa1adfc780"},
 ]
 
 [package.dependencies]
@@ -27,39 +27,39 @@ idna = ">=2.8"
 sniffio = ">=1.1"
 
 [package.extras]
-doc = ["Sphinx (>=7)", "packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphinx-rtd-theme"]
-test = ["anyio[trio]", "coverage[toml] (>=7)", "exceptiongroup (>=1.2.0)", "hypothesis (>=4.0)", "psutil (>=5.9)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (>=0.17)"]
-trio = ["trio (>=0.23)"]
+doc = ["Sphinx", "packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphinx-rtd-theme (>=1.2.2)", "sphinxcontrib-jquery"]
+test = ["anyio[trio]", "coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "mock (>=4)", "psutil (>=5.9)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (>=0.17)"]
+trio = ["trio (<0.22)"]
 
 [[package]]
 name = "black"
-version = "24.1.1"
+version = "24.2.0"
 description = "The uncompromising code formatter."
 optional = false
 python-versions = ">=3.8"
 files = [
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 [package.dependencies]
@@ -86,6 +86,105 @@ files = [
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 ]
 
+[[package]]
+name = "charset-normalizer"
+version = "3.3.2"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+optional = false
+python-versions = ">=3.7.0"
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+]
+
 [[package]]
 name = "click"
 version = "8.1.7"
@@ -175,6 +274,20 @@ files = [
 [package.extras]
 toml = ["tomli"]
 
+[[package]]
+name = "deprecation"
+version = "2.1.0"
+description = "A library to handle automated deprecations"
+optional = false
+python-versions = "*"
+files = [
+    {file = "deprecation-2.1.0-py2.py3-none-any.whl", hash = "sha256:a10811591210e1fb0e768a8c25517cabeabcba6f0bf96564f8ff45189f90b14a"},
+    {file = "deprecation-2.1.0.tar.gz", hash = "sha256:72b3bde64e5d778694b0cf68178aed03d15e15477116add3fb773e581f9518ff"},
+]
+
+[package.dependencies]
+packaging = "*"
+
 [[package]]
 name = "dnspython"
 version = "2.5.0"
@@ -195,6 +308,24 @@ idna = ["idna (>=2.1)"]
 trio = ["trio (>=0.14)"]
 wmi = ["wmi (>=1.5.1)"]
 
+[[package]]
+name = "ecdsa"
+version = "0.18.0"
+description = "ECDSA cryptographic signature library (pure python)"
+optional = false
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
+    {file = "ecdsa-0.18.0-py2.py3-none-any.whl", hash = "sha256:80600258e7ed2f16b9aa1d7c295bd70194109ad5a30fdee0eaeefef1d4c559dd"},
+    {file = "ecdsa-0.18.0.tar.gz", hash = "sha256:190348041559e21b22a1d65cee485282ca11a6f81d503fddb84d5017e9ed1e49"},
+]
+
+[package.dependencies]
+six = ">=1.9.0"
+
+[package.extras]
+gmpy = ["gmpy"]
+gmpy2 = ["gmpy2"]
+
 [[package]]
 name = "email-validator"
 version = "2.1.0.post1"
@@ -212,16 +343,17 @@ idna = ">=2.0.0"
 
 [[package]]
 name = "fastapi"
-version = "0.109.2"
+version = "0.104.1"
 description = "FastAPI framework, high performance, easy to learn, fast to code, ready for production"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "fastapi-0.109.2-py3-none-any.whl", hash = "sha256:2c9bab24667293b501cad8dd388c05240c850b58ec5876ee3283c47d6e1e3a4d"},
-    {file = "fastapi-0.109.2.tar.gz", hash = "sha256:f3817eac96fe4f65a2ebb4baa000f394e55f5fccdaf7f75250804bc58f354f73"},
+    {file = "fastapi-0.104.1-py3-none-any.whl", hash = "sha256:752dc31160cdbd0436bb93bad51560b57e525cbb1d4bbf6f4904ceee75548241"},
+    {file = "fastapi-0.104.1.tar.gz", hash = "sha256:e5e4540a7c5e1dcfbbcf5b903c234feddcdcd881f191977a1c5dfd917487e7ae"},
 ]
 
 [package.dependencies]
+anyio = ">=3.7.1,<4.0.0"
 email-validator = {version = ">=2.0.0", optional = true, markers = "extra == \"all\""}
 httpx = {version = ">=0.23.0", optional = true, markers = "extra == \"all\""}
 itsdangerous = {version = ">=1.1.0", optional = true, markers = "extra == \"all\""}
@@ -230,15 +362,15 @@ orjson = {version = ">=3.2.1", optional = true, markers = "extra == \"all\""}
 pydantic = ">=1.7.4,<1.8 || >1.8,<1.8.1 || >1.8.1,<2.0.0 || >2.0.0,<2.0.1 || >2.0.1,<2.1.0 || >2.1.0,<3.0.0"
 pydantic-extra-types = {version = ">=2.0.0", optional = true, markers = "extra == \"all\""}
 pydantic-settings = {version = ">=2.0.0", optional = true, markers = "extra == \"all\""}
-python-multipart = {version = ">=0.0.7", optional = true, markers = "extra == \"all\""}
+python-multipart = {version = ">=0.0.5", optional = true, markers = "extra == \"all\""}
 pyyaml = {version = ">=5.3.1", optional = true, markers = "extra == \"all\""}
-starlette = ">=0.36.3,<0.37.0"
+starlette = ">=0.27.0,<0.28.0"
 typing-extensions = ">=4.8.0"
 ujson = {version = ">=4.0.1,<4.0.2 || >4.0.2,<4.1.0 || >4.1.0,<4.2.0 || >4.2.0,<4.3.0 || >4.3.0,<5.0.0 || >5.0.0,<5.1.0 || >5.1.0", optional = true, markers = "extra == \"all\""}
 uvicorn = {version = ">=0.12.0", extras = ["standard"], optional = true, markers = "extra == \"all\""}
 
 [package.extras]
-all = ["email-validator (>=2.0.0)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)", "jinja2 (>=2.11.2)", "orjson (>=3.2.1)", "pydantic-extra-types (>=2.0.0)", "pydantic-settings (>=2.0.0)", "python-multipart (>=0.0.7)", "pyyaml (>=5.3.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0)", "uvicorn[standard] (>=0.12.0)"]
+all = ["email-validator (>=2.0.0)", "httpx (>=0.23.0)", "itsdangerous (>=1.1.0)", "jinja2 (>=2.11.2)", "orjson (>=3.2.1)", "pydantic-extra-types (>=2.0.0)", "pydantic-settings (>=2.0.0)", "python-multipart (>=0.0.5)", "pyyaml (>=5.3.1)", "ujson (>=4.0.1,!=4.0.2,!=4.1.0,!=4.2.0,!=4.3.0,!=5.0.0,!=5.1.0)", "uvicorn[standard] (>=0.12.0)"]
 
 [[package]]
 name = "h11"
@@ -585,6 +717,17 @@ files = [
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
+[[package]]
+name = "pyasn1"
+version = "0.5.1"
+description = "Pure-Python implementation of ASN.1 types and DER/BER/CER codecs (X.208)"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,>=2.7"
+files = [
+    {file = "pyasn1-0.5.1-py2.py3-none-any.whl", hash = "sha256:4439847c58d40b1d0a573d07e3856e95333f1976294494c325775aeca506eb58"},
+    {file = "pyasn1-0.5.1.tar.gz", hash = "sha256:6d391a96e59b23130a5cfa74d6fd7f388dbbe26cc8f1edf39fdddf08d9d6676c"},
+]
+
 [[package]]
 name = "pydantic"
 version = "2.6.1"
@@ -765,6 +908,40 @@ pytest = ">=4.6"
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "pytest-xdist", "six", "virtualenv"]
 
+[[package]]
+name = "pytest-env"
+version = "1.1.3"
+description = "pytest plugin that allows you to add environment variables."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pytest_env-1.1.3-py3-none-any.whl", hash = "sha256:aada77e6d09fcfb04540a6e462c58533c37df35fa853da78707b17ec04d17dfc"},
+    {file = "pytest_env-1.1.3.tar.gz", hash = "sha256:fcd7dc23bb71efd3d35632bde1bbe5ee8c8dc4489d6617fb010674880d96216b"},
+]
+
+[package.dependencies]
+pytest = ">=7.4.3"
+
+[package.extras]
+test = ["covdefaults (>=2.3)", "coverage (>=7.3.2)", "pytest-mock (>=3.12)"]
+
+[[package]]
+name = "pytest-mock"
+version = "3.12.0"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pytest-mock-3.12.0.tar.gz", hash = "sha256:31a40f038c22cad32287bb43932054451ff5583ff094bca6f675df2f8bc1a6e9"},
+    {file = "pytest_mock-3.12.0-py3-none-any.whl", hash = "sha256:0972719a7263072da3a21c7f4773069bcc7486027d7e8e1f81d98a47e701bc4f"},
+]
+
+[package.dependencies]
+pytest = ">=5.0"
+
+[package.extras]
+dev = ["pre-commit", "pytest-asyncio", "tox"]
+
 [[package]]
 name = "python-dotenv"
 version = "1.0.1"
@@ -779,6 +956,47 @@ files = [
 [package.extras]
 cli = ["click (>=5.0)"]
 
+[[package]]
+name = "python-jose"
+version = "3.3.0"
+description = "JOSE implementation in Python"
+optional = false
+python-versions = "*"
+files = [
+    {file = "python-jose-3.3.0.tar.gz", hash = "sha256:55779b5e6ad599c6336191246e95eb2293a9ddebd555f796a65f838f07e5d78a"},
+    {file = "python_jose-3.3.0-py2.py3-none-any.whl", hash = "sha256:9b1376b023f8b298536eedd47ae1089bcdb848f1535ab30555cd92002d78923a"},
+]
+
+[package.dependencies]
+ecdsa = "!=0.15"
+pyasn1 = "*"
+rsa = "*"
+
+[package.extras]
+cryptography = ["cryptography (>=3.4.0)"]
+pycrypto = ["pyasn1", "pycrypto (>=2.6.0,<2.7.0)"]
+pycryptodome = ["pyasn1", "pycryptodome (>=3.3.1,<4.0.0)"]
+
+[[package]]
+name = "python-keycloak"
+version = "3.8.0"
+description = "python-keycloak is a Python package providing access to the Keycloak API."
+optional = false
+python-versions = ">=3.8,<4.0"
+files = [
+    {file = "python_keycloak-3.8.0-py3-none-any.whl", hash = "sha256:9a578ee88eefd8993dff8f62e7dac564c7a5bf235b401c135e25795113767ac2"},
+    {file = "python_keycloak-3.8.0.tar.gz", hash = "sha256:ff1cc4127196dfbc7dae8184f72fe81cfe27199c440c9c6315531b84e976bd6b"},
+]
+
+[package.dependencies]
+deprecation = ">=2.1.0"
+python-jose = ">=3.3.0"
+requests = ">=2.20.0"
+requests-toolbelt = ">=0.6.0"
+
+[package.extras]
+docs = ["Sphinx (>=6.1.0,<7.0.0)", "alabaster (>=0.7.12,<0.8.0)", "commonmark (>=0.9.1,<0.10.0)", "m2r2 (>=0.3.2,<0.4.0)", "mock (>=4.0.3,<5.0.0)", "readthedocs-sphinx-ext (>=2.1.9,<3.0.0)", "recommonmark (>=0.7.1,<0.8.0)", "sphinx-autoapi (>=3.0.0,<4.0.0)", "sphinx-rtd-theme (>=1.0.0,<2.0.0)"]
+
 [[package]]
 name = "python-multipart"
 version = "0.0.7"
@@ -853,6 +1071,77 @@ files = [
     {file = "PyYAML-6.0.1.tar.gz", hash = "sha256:bfdf460b1736c775f2ba9f6a92bca30bc2095067b8a9d77876d1fad6cc3b4a43"},
 ]
 
+[[package]]
+name = "regtech-api-commons"
+version = "0.1.0"
+description = ""
+optional = false
+python-versions = "^3.11"
+files = []
+develop = false
+
+[package.dependencies]
+fastapi = "^0.104.1"
+pydantic-settings = "^2.1.0"
+python-jose = "^3.3.0"
+python-keycloak = "^3.7.0"
+requests = "^2.31.0"
+
+[package.source]
+type = "git"
+url = "https://github.com/cfpb/regtech-api-commons.git"
+reference = "HEAD"
+resolved_reference = "741f6c6e956276f59924a497df8a03609eb82a62"
+
+[[package]]
+name = "requests"
+version = "2.31.0"
+description = "Python HTTP for Humans."
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "requests-2.31.0-py3-none-any.whl", hash = "sha256:58cd2187c01e70e6e26505bca751777aa9f2ee0b7f4300988b709f44e013003f"},
+    {file = "requests-2.31.0.tar.gz", hash = "sha256:942c5a758f98d790eaed1a29cb6eefc7ffb0d1cf7af05c3d2791656dbd6ad1e1"},
+]
+
+[package.dependencies]
+certifi = ">=2017.4.17"
+charset-normalizer = ">=2,<4"
+idna = ">=2.5,<4"
+urllib3 = ">=1.21.1,<3"
+
+[package.extras]
+socks = ["PySocks (>=1.5.6,!=1.5.7)"]
+use-chardet-on-py3 = ["chardet (>=3.0.2,<6)"]
+
+[[package]]
+name = "requests-toolbelt"
+version = "1.0.0"
+description = "A utility belt for advanced users of python-requests"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+files = [
+    {file = "requests-toolbelt-1.0.0.tar.gz", hash = "sha256:7681a0a3d047012b5bdc0ee37d7f8f07ebe76ab08caeccfc3921ce23c88d5bc6"},
+    {file = "requests_toolbelt-1.0.0-py2.py3-none-any.whl", hash = "sha256:cccfdd665f0a24fcf4726e690f65639d272bb0637b9b92dfd91a5568ccf6bd06"},
+]
+
+[package.dependencies]
+requests = ">=2.0.1,<3.0.0"
+
+[[package]]
+name = "rsa"
+version = "4.9"
+description = "Pure-Python RSA implementation"
+optional = false
+python-versions = ">=3.6,<4"
+files = [
+    {file = "rsa-4.9-py3-none-any.whl", hash = "sha256:90260d9058e514786967344d0ef75fa8727eed8a7d2e43ce9f4bcf1b536174f7"},
+    {file = "rsa-4.9.tar.gz", hash = "sha256:e38464a49c6c85d7f1351b0126661487a7e0a14a50f1675ec50eb34d4f20ef21"},
+]
+
+[package.dependencies]
+pyasn1 = ">=0.1.3"
+
 [[package]]
 name = "ruff"
 version = "0.1.15"
@@ -879,6 +1168,17 @@ files = [
     {file = "ruff-0.1.15.tar.gz", hash = "sha256:f6dfa8c1b21c913c326919056c390966648b680966febcb796cc9d1aaab8564e"},
 ]
 
+[[package]]
+name = "six"
+version = "1.16.0"
+description = "Python 2 and 3 compatibility utilities"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
+    {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
+    {file = "six-1.16.0.tar.gz", hash = "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926"},
+]
+
 [[package]]
 name = "sniffio"
 version = "1.3.0"
@@ -892,20 +1192,20 @@ files = [
 
 [[package]]
 name = "starlette"
-version = "0.36.3"
+version = "0.27.0"
 description = "The little ASGI library that shines."
 optional = false
-python-versions = ">=3.8"
+python-versions = ">=3.7"
 files = [
-    {file = "starlette-0.36.3-py3-none-any.whl", hash = "sha256:13d429aa93a61dc40bf503e8c801db1f1bca3dc706b10ef2434a36123568f044"},
-    {file = "starlette-0.36.3.tar.gz", hash = "sha256:90a671733cfb35771d8cc605e0b679d23b992f8dcfad48cc60b38cb29aeb7080"},
+    {file = "starlette-0.27.0-py3-none-any.whl", hash = "sha256:918416370e846586541235ccd38a474c08b80443ed31c578a418e2209b3eef91"},
+    {file = "starlette-0.27.0.tar.gz", hash = "sha256:6a6b0d042acb8d469a01eba54e9cda6cbd24ac602c4cd016723117d6a7e73b75"},
 ]
 
 [package.dependencies]
 anyio = ">=3.4.0,<5"
 
 [package.extras]
-full = ["httpx (>=0.22.0)", "itsdangerous", "jinja2", "python-multipart (>=0.0.7)", "pyyaml"]
+full = ["httpx (>=0.22.0)", "itsdangerous", "jinja2", "python-multipart", "pyyaml"]
 
 [[package]]
 name = "typing-extensions"
@@ -992,6 +1292,23 @@ files = [
     {file = "ujson-5.9.0.tar.gz", hash = "sha256:89cc92e73d5501b8a7f48575eeb14ad27156ad092c2e9fc7e3cf949f07e75532"},
 ]
 
+[[package]]
+name = "urllib3"
+version = "2.2.0"
+description = "HTTP library with thread-safe connection pooling, file post, and more."
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "urllib3-2.2.0-py3-none-any.whl", hash = "sha256:ce3711610ddce217e6d113a2732fafad960a03fd0318c91faa79481e35c11224"},
+    {file = "urllib3-2.2.0.tar.gz", hash = "sha256:051d961ad0c62a94e50ecf1af379c3aba230c66c710493493560c0c223c49f20"},
+]
+
+[package.extras]
+brotli = ["brotli (>=1.0.9)", "brotlicffi (>=0.8.0)"]
+h2 = ["h2 (>=4,<5)"]
+socks = ["pysocks (>=1.5.6,!=1.5.7,<2.0)"]
+zstd = ["zstandard (>=0.18.0)"]
+
 [[package]]
 name = "uvicorn"
 version = "0.27.1"
@@ -1232,4 +1549,4 @@ files = [
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.12"
-content-hash = "9c0171ee9f50ff907b700f62727c2af1aae9f0a8bc658ca4835d8286dfd217da"
+content-hash = "9eaee24e3488ac7b0310250b8d72b5026c5c68bf6056e61c590fe92e19a30d84"
diff --git a/pyproject.toml b/pyproject.toml
index 21c874b..16e7254 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,15 +11,18 @@ packages = [
 
 [tool.poetry.dependencies]
 python = "^3.12"
-fastapi = {extras = ["all"], version = "^0.109.0"}
+fastapi = {extras = ["all"], version = "^0.104.1"}
 uvicorn = "^0.27.0.post1"
 pyyaml = "^6.0.1"
 email-validator = "^2.1.0.post1"
 python-multipart = "^0.0.7"
+regtech-api-commons = {git = "https://github.com/cfpb/regtech-api-commons.git"}
 
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^8.0.0"
+pytest-mock = "^3.12.0"
+pytest-env = "^1.1.3"
 pytest-cov = "^4.1.0"
 
 
@@ -31,8 +34,23 @@ black = "^24.1.1"
 requires = ["poetry-core"]
 build-backend = "poetry.core.masonry.api"
 
-# Testing
 [tool.pytest.ini_options]
+pythonpath = ["regtech_mail_api"]
+testpaths = ["tests"]
+env = [
+  "KC_URL=http://localhost",
+  "KC_REALM=",
+  "KC_ADMIN_CLIENT_ID=",
+  "KC_ADMIN_CLIENT_SECRET=",
+  "KC_REALM_URL=http://localhost",
+  "AUTH_URL=http://localhost",
+  "TOKEN_URL=http://localhost",
+  "CERTS_URL=http://localhost",
+  "AUTH_CLIENT=",
+  "EMAIL_MAILER=mock",
+  "FROM_ADDR=test@cfpb.gov",
+  "TO=cases@localhost.localdomain"
+]
 addopts = [
     "--cov-report=term-missing",
     "--cov-branch",
@@ -43,13 +61,10 @@ addopts = [
     "--strict-markers",
     "-rfE",
 ]
-testpaths = [
-    "tests",
-]
 
 [tool.coverage.run]
 relative_files = true
 source = ["regtech_mail_api"]
 
 [tool.coverage.report]
-skip_empty = true
\ No newline at end of file
+skip_empty = true
diff --git a/regtech_mail_api/api.py b/regtech_mail_api/api.py
index 5c99033..31f6221 100644
--- a/regtech_mail_api/api.py
+++ b/regtech_mail_api/api.py
@@ -1,11 +1,38 @@
 from fastapi import FastAPI, Request
-from regtech_mail_api.mailer import Mailer, MockMailer, SmtpMailer
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.security import OAuth2AuthorizationCodeBearer
 
+from regtech_mail_api.mailer import Mailer, MockMailer, SmtpMailer
 from regtech_mail_api.models import Email
-from regtech_mail_api.settings import EmailApiSettings, EmailMailerType
+from regtech_mail_api.settings import EmailApiSettings, EmailMailerType, kc_settings
+
+from starlette.authentication import requires
+from starlette.middleware.authentication import AuthenticationMiddleware
+
+from regtech_api_commons.oauth2.oauth2_backend import BearerTokenAuthBackend
+from regtech_api_commons.oauth2.oauth2_admin import OAuth2Admin
 
 app = FastAPI()
 
+token_bearer = OAuth2AuthorizationCodeBearer(
+    authorizationUrl=kc_settings.auth_url.unicode_string(),
+    tokenUrl=kc_settings.token_url.unicode_string(),
+)
+
+app.add_middleware(
+    AuthenticationMiddleware,
+    backend=BearerTokenAuthBackend(token_bearer, OAuth2Admin(kc_settings)),
+)
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=[
+        "*"
+    ],  # thinking this should be derived from an env var from docker-compose or helm values
+    allow_methods=["GET", "POST"],
+    allow_headers=["authorization"],
+)
+
+
 # FIXME: Come up with a better way of handling these settings
 #        without having to do all the `type: ignore`s
 settings = EmailApiSettings()  # type: ignore
@@ -27,7 +54,8 @@
 
 
 @app.get("/")
-def read_root():
+@requires("authenticated")
+def read_root(request: Request):
     return {"message": "Welcome to the Email API"}
 
 
@@ -45,6 +73,7 @@ async def get_debug_info(request: Request):
 
 
 @app.post("/send")
+@requires("authenticated")
 async def send_email(request: Request):
     headers = request.headers
     subject = headers["X-Mail-Subject"]
diff --git a/regtech_mail_api/settings.py b/regtech_mail_api/settings.py
index 8b6e782..aae6367 100644
--- a/regtech_mail_api/settings.py
+++ b/regtech_mail_api/settings.py
@@ -2,6 +2,8 @@
 from pydantic import EmailStr, SecretStr, model_validator
 from pydantic_settings import BaseSettings
 
+from regtech_api_commons.oauth2.config import KeycloakSettings
+
 
 class EmailMailerType(str, Enum):
     MOCK = "mock"
@@ -33,3 +35,6 @@ def check_smtp(self):
                 raise ValueError("SMTP host must be set when using SMTP email sender")
 
         return self
+
+
+kc_settings = KeycloakSettings()
diff --git a/tests/test_authentication.py b/tests/test_authentication.py
new file mode 100644
index 0000000..2989402
--- /dev/null
+++ b/tests/test_authentication.py
@@ -0,0 +1,99 @@
+import pytest
+
+from fastapi import FastAPI
+from fastapi.testclient import TestClient
+from pytest_mock import MockerFixture
+from unittest.mock import Mock
+
+from regtech_api_commons.models.auth import AuthenticatedUser
+from starlette.authentication import AuthCredentials, UnauthenticatedUser
+
+
+@pytest.fixture
+def app_fixture(mocker: MockerFixture) -> FastAPI:
+    from api import app
+
+    return app
+
+
+@pytest.fixture
+def auth_mock(mocker: MockerFixture) -> Mock:
+    return mocker.patch(
+        "regtech_api_commons.oauth2.oauth2_backend.BearerTokenAuthBackend.authenticate"
+    )
+
+
+@pytest.fixture
+def authed_user_mock(auth_mock: Mock) -> Mock:
+    claims = {
+        "preferred_username": "test_user",
+        "email": "test@cfpb.gov",
+    }
+    auth_mock.return_value = (
+        AuthCredentials(["authenticated"]),
+        AuthenticatedUser.from_claim(claims),
+    )
+    return auth_mock
+
+
+@pytest.fixture
+def unauthed_user_mock(auth_mock: Mock) -> Mock:
+    auth_mock.return_value = (AuthCredentials("unauthenticated"), UnauthenticatedUser())
+    return auth_mock
+
+
+class TestEmailApiAuthentication:
+
+    def test_unauthed_endpoints(
+        self, mocker: MockerFixture, app_fixture: FastAPI, unauthed_user_mock: Mock
+    ):
+        client = TestClient(app_fixture)
+        res = client.get("/")
+        assert res.status_code == 403
+
+        client = TestClient(app_fixture)
+        res = client.post(
+            "/send",
+            json={"data": "data"},
+        )
+        assert res.status_code == 403
+
+    def test_authed_endpoints(
+        self, mocker: MockerFixture, app_fixture: FastAPI, authed_user_mock: Mock
+    ):
+        email_json = {
+            "email": {
+                "subject": "Institution Profile Change",
+                "body": "lei: 1234567890ABCDEFGHIJ\ninstitution_name_1: Fintech 1\ntin_1: 12-3456789\nrssd_1: 1234567",
+                "from_addr": "test@cfpb.gov",
+                "sender": "Jane Doe <jane.doe@some.org>",
+                "to": ["cases@localhost.localdomain"],
+                "cc": None,
+                "bcc": None,
+            }
+        }
+
+        mock = mocker.patch("api.send_email")
+        mock.return_value = {"email": email_json}
+        client = TestClient(app_fixture)
+        res = client.get("/")
+        assert res.status_code == 200
+
+        client = TestClient(app_fixture)
+        res = client.post(
+            "/send",
+            json=email_json,
+            headers={
+                "X-Mail-Subject": "Institution Profile Change",
+                "X-Mail-Sender-Address": "jane.doe@some.org",
+                "X-Mail-Sender-Name": "Jane Doe",
+            },
+            data={
+                "lei": "1234567890ABCDEFGHIJ",
+                "institution_name_1": "Fintech 1",
+                "tin_1": "12-3456789",
+                "rssd_1": "1234567",
+            },
+        )
+        assert res.status_code == 200
+        assert res.json() == email_json