diff --git a/src/MinFraud/Util.php b/src/MinFraud/Util.php
index 8057b80..7751461 100644
--- a/src/MinFraud/Util.php
+++ b/src/MinFraud/Util.php
@@ -127,6 +127,7 @@ class Util
         'fastemailer.com' => true,
         'fastest.cc' => true,
         'fastimap.com' => true,
+        'fastmail.ca' => true,
         'fastmail.cn' => true,
         'fastmail.co.uk' => true,
         'fastmail.com' => true,
@@ -223,6 +224,7 @@ class Util
      * @var array<string, bool>
      */
     private static $yahooDomains = [
+        'myyahoo.com' => true,
         'y7mail.com' => true,
         'yahoo.at' => true,
         'yahoo.be' => true,
diff --git a/tests/MaxMind/Test/MinFraud/UtilTest.php b/tests/MaxMind/Test/MinFraud/UtilTest.php
index 6c50757..e6d073c 100644
--- a/tests/MaxMind/Test/MinFraud/UtilTest.php
+++ b/tests/MaxMind/Test/MinFraud/UtilTest.php
@@ -188,6 +188,16 @@ public function testMaybeHashEmail(): void
                     ],
                 ],
             ],
+            [
+                'name' => 'Fastmail Canada alias domain',
+                'input' => ['email' => ['address' => 'alias@user.fastmail.ca']],
+                'expected' => [
+                    'email' => [
+                        'address' => md5('user@fastmail.ca'),
+                        'domain' => 'user.fastmail.ca',
+                    ],
+                ],
+            ],
             [
                 'name' => 'Domain with multiple host parts',
                 'input' => ['email' => ['address' => 'foo@bar.example.com']],
@@ -208,6 +218,16 @@ public function testMaybeHashEmail(): void
                     ],
                 ],
             ],
+            [
+                'name' => 'Alternate Yahoo signup domain',
+                'input' => ['email' => ['address' => 'test-alias@myyahoo.com']],
+                'expected' => [
+                    'email' => [
+                        'address' => md5('test@myyahoo.com'),
+                        'domain' => 'myyahoo.com',
+                    ],
+                ],
+            ],
             [
                 'name' => '.com.com',
                 'input' => ['email' => ['address' => 'foo@example.com.com']],