D5871.1775762991.diff
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	diff --git a/src/app/Policy/SmtpAccess.php b/src/app/Policy/SmtpAccess.php
	--- a/src/app/Policy/SmtpAccess.php
	+++ b/src/app/Policy/SmtpAccess.php
	@@ -17,7 +17,7 @@
	public static function reception($data): Response
	{
	// Check access policy
	- if (!self::verifyRecipient($data['sender'], $data['recipient'])) {
	+ if (!self::verifyRecipient($data['sender'] ?? '', $data['recipient'])) {
	return new Response(Response::ACTION_REJECT, 'Invalid recipient', 403);
	}

	@@ -144,6 +144,7 @@
	$sender = \strtolower($sender);

	if (!str_contains($sender, '@')) {
	+ // FIXME: $sender can be empty in case of an empty SMTP FROM
	return false;
	}