diff --git a/activitypub.php b/activitypub.php
index 0a5c156..b1f8ed4 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -180,7 +180,16 @@ add_filter(
 					}
 				}
 			}
-			if ( rtrim( strtok( $domain, '.' ), '0123456789' ) === 'example' ) {
+			if ( preg_match( '/[^a-zA-Z0-9.-]/', $domain ) ) {// invalid characters
+				return $metadata;
+			}
+
+			if (
+				rtrim( strtok( $domain, '.' ), '0123456789' ) === 'example' // classic example.org domain
+				|| preg_match( '/(my|your|our)-(domain)/', $domain )
+				|| preg_match( '/(test)/', $domain )
+				|| in_array( $username, array( 'example' ), true )
+				) {
 				$metadata = array(
 					'url' => sprintf( 'https://%s/users/%s/', $domain, $username ),
 					'name' => $username,
diff --git a/tests/test-functions.php b/tests/test-functions.php
index 3887de3..81fc68f 100644
--- a/tests/test-functions.php
+++ b/tests/test-functions.php
@@ -24,7 +24,7 @@ class Test_Functions extends ActivityPub_TestCase_Cache_HTTP {
 	public function example_actors() {
 		$actors = array();
 		foreach ( array( 'user', 'test' ) as $username ) {
-			foreach ( array( 'example.org', 'example.net', 'example2.com' ) as $domain ) {
+			foreach ( array( 'example.org', 'example.net', 'example2.com', 'my-domain.com', 'your-domain.org', 'test.net' ) as $domain ) {
 				foreach ( array( '@', '' ) as $leading_at ) {
 					$actors[] = array( $leading_at . $username . '@' . $domain, $domain, $username );
 				}
@@ -33,6 +33,9 @@ class Test_Functions extends ActivityPub_TestCase_Cache_HTTP {
 				$actors[] = array( sprintf( 'https://%s/@%s', $domain, $username ), $domain, $username );
 			}
 		}
+
+		$actors[] = array( 'example@abc.org', 'abc.org', 'example' );
+
 		return $actors;
 	}
 }