diff --git a/composer.json b/composer.json
index a4af3c6..4e66108 100644
--- a/composer.json
+++ b/composer.json
@@ -22,6 +22,7 @@
         "symfony/process": "4.4.*",
         "symfony/security-bundle": "4.4.*",
         "symfony/serializer-pack": "*",
+        "symfony/swiftmailer-bundle": "^3.4",
         "symfony/translation": "4.4.*",
         "symfony/twig-pack": "*",
         "symfony/validator": "4.4.*",
diff --git a/config/bundles.php b/config/bundles.php
index 1a40026..c38af0d 100644
--- a/config/bundles.php
+++ b/config/bundles.php
@@ -13,4 +13,5 @@ return [
     Symfony\Bundle\DebugBundle\DebugBundle::class => ['dev' => true, 'test' => true],
     Symfony\Bundle\MakerBundle\MakerBundle::class => ['dev' => true],
     Symfony\Bundle\WebServerBundle\WebServerBundle::class => ['dev' => true],
+    Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle::class => ['all' => true],
 ];
diff --git a/config/packages/dev/swiftmailer.yaml b/config/packages/dev/swiftmailer.yaml
new file mode 100644
index 0000000..b98158e
--- /dev/null
+++ b/config/packages/dev/swiftmailer.yaml
@@ -0,0 +1,4 @@
+# See https://symfony.com/doc/current/email/dev_environment.html
+swiftmailer:
+    # send all emails to a specific address
+    #delivery_addresses: ['me@example.com']
diff --git a/config/packages/swiftmailer.yaml b/config/packages/swiftmailer.yaml
new file mode 100644
index 0000000..cae6508
--- /dev/null
+++ b/config/packages/swiftmailer.yaml
@@ -0,0 +1,3 @@
+swiftmailer:
+    url: '%env(MAILER_URL)%'
+    spool: { type: 'memory' }
diff --git a/config/packages/test/swiftmailer.yaml b/config/packages/test/swiftmailer.yaml
new file mode 100644
index 0000000..f438078
--- /dev/null
+++ b/config/packages/test/swiftmailer.yaml
@@ -0,0 +1,2 @@
+swiftmailer:
+    disable_delivery: true
diff --git a/src/Controller/HygrometryApiController.php b/src/Controller/HygrometryApiController.php
index 55cd0cf..7dea0ef 100644
--- a/src/Controller/HygrometryApiController.php
+++ b/src/Controller/HygrometryApiController.php
@@ -14,7 +14,7 @@ class HygrometryApiController extends AbstractController
     /**
      * @Route("/api/hygrometry/create", name="api_hygrometry_create", methods={"POST"})
      */
-    public function create(Request $request, ApiValidator $validator): Response
+    public function create(Request $request, ApiValidator $validator, \Swift_Mailer $mailer): Response
     {
         if ('application/json' === $request->getContentType()) {
             return $this->json([], 400);
@@ -37,6 +37,22 @@ class HygrometryApiController extends AbstractController
         $manager->persist($entity);
         $manager->flush();
 
+        if ($entity->getValue() >= 50) {
+            $message = (new \Swift_Message('[Terrarium] Alerte hygométrie'))
+                ->setFrom('terrarium@deblan.fr')
+                ->setTo(['simon@deblan.fr', 'jennifer@derago.fr'])
+                ->setBody(
+                    $this->renderView(
+                        'alert/hygrometry.txt.twig',
+                        [
+                            'entity' => $entity,
+                        ]
+                    )
+                );
+
+            $mailer->send($message);
+        }
+
         return $this->json([], 201);
     }
 }
diff --git a/src/Controller/TemperatureApiController.php b/src/Controller/TemperatureApiController.php
index b843c62..5126065 100644
--- a/src/Controller/TemperatureApiController.php
+++ b/src/Controller/TemperatureApiController.php
@@ -14,7 +14,7 @@ class TemperatureApiController extends AbstractController
     /**
      * @Route("/api/temperature/create", name="api_temperature_create", methods={"POST"})
      */
-    public function create(Request $request, ApiValidator $validator): Response
+    public function create(Request $request, ApiValidator $validator, \Swift_Mailer $mailer): Response
     {
         if ('application/json' === $request->getContentType()) {
             return $this->json([], 400);
@@ -37,6 +37,22 @@ class TemperatureApiController extends AbstractController
         $manager->persist($entity);
         $manager->flush();
 
+        if ($entity->getValue() < 25) {
+            $message = (new \Swift_Message('[Terrarium] Alerte température'))
+                ->setFrom('terrarium@deblan.fr')
+                ->setTo(['simon@deblan.fr', 'jennifer@derago.fr'])
+                ->setBody(
+                    $this->renderView(
+                        'alert/temperature.txt.twig',
+                        [
+                            'entity' => $entity,
+                        ]
+                    )
+                );
+
+            $mailer->send($message);
+        }
+
         return $this->json([], 201);
     }
 }
diff --git a/symfony.lock b/symfony.lock
index c43b36e..f9e87a5 100644
--- a/symfony.lock
+++ b/symfony.lock
@@ -141,6 +141,9 @@
             "config/packages/sensio_framework_extra.yaml"
         ]
     },
+    "swiftmailer/swiftmailer": {
+        "version": "v6.2.3"
+    },
     "symfony/apache-pack": {
         "version": "1.0",
         "recipe": {
@@ -424,6 +427,20 @@
     "symfony/stopwatch": {
         "version": "v4.4.5"
     },
+    "symfony/swiftmailer-bundle": {
+        "version": "2.5",
+        "recipe": {
+            "repo": "github.com/symfony/recipes",
+            "branch": "master",
+            "version": "2.5",
+            "ref": "ae4d22af30bbd484506bc1817c5a3ef72c855b93"
+        },
+        "files": [
+            "config/packages/dev/swiftmailer.yaml",
+            "config/packages/swiftmailer.yaml",
+            "config/packages/test/swiftmailer.yaml"
+        ]
+    },
     "symfony/test-pack": {
         "version": "v1.0.6"
     },
diff --git a/templates/alert/hygrometry.txt.twig b/templates/alert/hygrometry.txt.twig
new file mode 100644
index 0000000..bb496f5
--- /dev/null
+++ b/templates/alert/hygrometry.txt.twig
@@ -0,0 +1,2 @@
+Date : {{ entity.date.format('d/m/Y H:i:s') }}
+Niveau hygrométrique : {{ entity.value }}%
diff --git a/templates/alert/temperature.txt.twig b/templates/alert/temperature.txt.twig
new file mode 100644
index 0000000..683d77d
--- /dev/null
+++ b/templates/alert/temperature.txt.twig
@@ -0,0 +1,2 @@
+Date : {{ entity.date.format('d/m/Y H:i:s') }}
+Température : {{ entity.value }}°