diff --git a/apps/settings/templates/settings/admin/additional-mail.php b/apps/settings/templates/settings/admin/additional-mail.php
index c6548d88737b0..4e81e52c83bb2 100644
--- a/apps/settings/templates/settings/admin/additional-mail.php
+++ b/apps/settings/templates/settings/admin/additional-mail.php
@@ -45,7 +45,7 @@
 
 $mail_sendmailmode = [
 	'smtp' => 'smtp (-bs)',
-	'pipe' => 'pipe (-t)'
+	'pipe' => 'pipe (-t -i)'
 ];
 
 ?>
diff --git a/tests/lib/Mail/MailerTest.php b/tests/lib/Mail/MailerTest.php
index a93086a201fdd..71e14e072804e 100644
--- a/tests/lib/Mail/MailerTest.php
+++ b/tests/lib/Mail/MailerTest.php
@@ -72,7 +72,7 @@ protected function setUp(): void {
 	public function sendmailModeProvider(): array {
 		return [
 			'smtp' => ['smtp', ' -bs'],
-			'pipe' => ['pipe', ' -t'],
+			'pipe' => ['pipe', ' -t -i'],
 		];
 	}