diff --git a/scripts/send_email.php b/scripts/send_email.php
index 3a769813..f32ad622 100755
--- a/scripts/send_email.php
+++ b/scripts/send_email.php
@@ -34,7 +34,7 @@ function log_msg(string $msg): void
     echo '[' . date('Y-m-d H:i:s') . '] ' . $msg . PHP_EOL;
 }
 
-function download_pdf(string $url): string|false
+function download_pdf(string $url)
 {
     $ch = curl_init($url);
     curl_setopt_array($ch, [
@@ -59,7 +59,7 @@ function download_pdf(string $url): string|false
     return $data;
 }
 
-function encrypt_pdf(string $input_path, string $password): string|false
+function encrypt_pdf(string $input_path, string $password)
 {
     $output_path = $input_path . '_enc.pdf';
     $cmd = sprintf(
@@ -126,7 +126,7 @@ function send_email(
     string $subject,
     string $body_html,
     array  $attachments = []
-): ?string {
+) {
     $socket = @fsockopen('tcp://' . $smtp['server'], SMTP_PORT, $errno, $errstr, 30);
     if (!$socket) {
         return "Connection to {$smtp['server']}:" . SMTP_PORT . " failed: $errstr ($errno)";