diff --git a/apps/settings/templates/settings/admin/additional-mail.php b/apps/settings/templates/settings/admin/additional-mail.php
index 7b88e99736954..7f0f362e9554e 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/lib/private/Mail/Mailer.php b/lib/private/Mail/Mailer.php
index 9b7b3cf117b03..61dc6f9214be6 100644
--- a/lib/private/Mail/Mailer.php
+++ b/lib/private/Mail/Mailer.php
@@ -331,7 +331,7 @@ protected function getSendMailInstance(): SendmailTransport {
 		}
 
 		$binaryParam = match ($this->config->getSystemValueString('mail_sendmailmode', 'smtp')) {
-			'pipe' => ' -t',
+			'pipe' => ' -t -i',
 			default => ' -bs',
 		};
 
diff --git a/tests/lib/Mail/MailerTest.php b/tests/lib/Mail/MailerTest.php
index 418bfe35c6e57..0eee7db126a71 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'],
 		];
 	}