diff --git a/app/Console/Commands/User/CheckUserEmailExist.php b/app/Console/Commands/User/CheckUserEmailExist.php
new file mode 100644
index 00000000..5b33f180
--- /dev/null
+++ b/app/Console/Commands/User/CheckUserEmailExist.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Console\Commands\User;
+
+use App\Services\WikiUserEmailChecker;
+use App\User;
+use Illuminate\Console\Command;
+
+class CheckUserEmailExist extends Command {
+    protected $signature = 'wbs-user:check-email {emails*}';
+
+    protected $description = 'Check if emails exist in apidb.users or any MediaWiki user table';
+
+    public function handle(WikiUserEmailChecker $emailChecker): int {
+        $emails = $this->argument('emails');
+        foreach ($emails as $email) {
+            $found = false;
+
+            if (User::whereEmail($email)->exists()) {
+                $this->line("FOUND: {$email} in apidb.users");
+                $found = true;
+            }
+
+            $mwResults = $emailChecker->findEmail($email);
+
+            foreach ($mwResults as $location) {
+                $this->line("FOUND: {$email} in {$location}");
+                $found = true;
+            }
+
+            if (!$found) {
+                $this->line("NOT FOUND: {$email}");
+            }
+
+            $this->line('-------------------------------------------------');
+        }
+
+        return 0;
+    }
+}
diff --git a/app/Services/WikiUserEmailChecker.php b/app/Services/WikiUserEmailChecker.php
new file mode 100644
index 00000000..fff4c9ed
--- /dev/null
+++ b/app/Services/WikiUserEmailChecker.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace App\Services;
+
+use Illuminate\Database\DatabaseManager;
+use PDO;
+
+class WikiUserEmailChecker {
+    public function __construct(private DatabaseManager $db) {}
+
+    public function findEmail(string $email): array {
+        $this->db->purge('mw');
+        $pdo = $this->db->connection('mw')->getPdo();
+
+        $mwDatabases = $pdo
+            ->query("SHOW DATABASES LIKE 'mwdb_%'")
+            ->fetchAll(PDO::FETCH_COLUMN);
+
+        $foundIn = [];
+
+        foreach ($mwDatabases as $dbName) {
+            $userTable = $this->findUserTable($pdo, $dbName);
+
+            if (!$userTable) {
+                continue;
+            }
+
+            if ($this->emailExists($pdo, $dbName, $userTable, $email)) {
+                $foundIn[] = "{$dbName}.{$userTable}";
+            }
+        }
+
+        return $foundIn;
+    }
+
+    private function findUserTable(PDO $pdo, string $dbName): ?string {
+        $stmt = $pdo->prepare("
+            SELECT TABLE_NAME
+            FROM INFORMATION_SCHEMA.TABLES
+            WHERE TABLE_SCHEMA = :db
+              AND TABLE_NAME LIKE '%\_user'
+            LIMIT 1
+        ");
+
+        $stmt->execute(['db' => $dbName]);
+
+        return $stmt->fetchColumn() ?: null;
+    }
+
+    private function emailExists(PDO $pdo, string $dbName, string $table, string $email): bool {
+        $stmt = $pdo->prepare("
+            SELECT 1
+            FROM {$dbName}.{$table}
+            WHERE user_email = :email
+            LIMIT 1
+        ");
+
+        $stmt->execute(['email' => $email]);
+
+        return (bool) $stmt->fetch();
+    }
+}
diff --git a/tests/Commands/User/CheckUserEmailExistTest.php b/tests/Commands/User/CheckUserEmailExistTest.php
new file mode 100644
index 00000000..57d74867
--- /dev/null
+++ b/tests/Commands/User/CheckUserEmailExistTest.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Tests\Commands;
+
+use App\Services\WikiUserEmailChecker;
+use App\User;
+use Mockery;
+use Tests\TestCase;
+
+class CheckUserEmailExistTest extends TestCase {
+    public function testItFindsEmailInApiUsersTable() {
+        User::factory()->create([
+            'email' => 'user@example.com',
+        ]);
+
+        // Act & Assert
+        $this->artisan('wbs-user:check-email', ['emails' => ['user@example.com']])
+            ->expectsOutput('FOUND: user@example.com in apidb.users')
+            ->assertExitCode(0);
+    }
+
+    public function testItReturnsNotFoundIfEmailDoesNotExist() {
+        $this->artisan('wbs-user:check-email', ['emails' => ['nonexistent@example.com']])
+            ->expectsOutput('NOT FOUND: nonexistent@example.com')
+            ->assertExitCode(0);
+    }
+
+    public function testItChecksMultipleEmails() {
+        User::factory()->create(['email' => 'user1@example.com']);
+
+        $emails = ['user1@example.com', 'other@example.com'];
+
+        $this->artisan('wbs-user:check-email', ['emails' => $emails])
+            ->expectsOutput('FOUND: user1@example.com in apidb.users')
+            ->expectsOutput('NOT FOUND: other@example.com')
+            ->assertExitCode(0);
+    }
+
+    public function testEmailFoundInWikiDb() {
+        $checker = Mockery::mock(WikiUserEmailChecker::class);
+
+        $checker->shouldReceive('findEmail')
+            ->with('test@example.com')
+            ->andReturn(['mwdb_test.mwdb_test_user']);
+
+        $this->app->instance(WikiUserEmailChecker::class, $checker);
+
+        $this->artisan('wbs-user:check-email', [
+            'emails' => ['test@example.com'],
+        ])
+            ->expectsOutput('FOUND: test@example.com in mwdb_test.mwdb_test_user')
+            ->assertExitCode(0);
+    }
+}