update

app/Support/EmailRecipients.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Support;
+
+final class EmailRecipients
+{
+    /**
+     * @return array<int, string>
+     */
+    public static function parse(?string $value): array
+    {
+        if (!$value) {
+            return [];
+        }
+
+        return collect(preg_split('/[,;]+/', $value) ?: [])
+            ->map(fn ($email) => trim((string) $email))
+            ->filter(fn ($email) => $email !== '' && filter_var($email, FILTER_VALIDATE_EMAIL))
+            ->unique()
+            ->values()
+            ->all();
+    }
+}