Gmail APIヘッダーには返信しない - 返信できない

Question

PHPを使用& Gmailのメッセージを取得してメッセージに返信するには、Gmailのapiクライアントを使用します。ヘッダーを見ると、返信はありません。私は戻って取得ヘッダがあり、実際のアドレスに返信されたアレイに...どこここ

$service = new \Google_Service_Gmail($client); 
$message = $service->users_messages->get("me", $messageId); 
$messagePayload = $message->getPayload(); 
$headers = $message->getPayload()->getHeaders(); 

：

は、ここに私のコードです。ヘッダーにIn-Reply-Toヘッダーが指定されていない場合、APIを使用してこのメ​​ッセージをどのように処理するのか、それとも応答するのかを知るにはどうすればよいですか？

アレイ（ [0] =>配列 （ [名] =>配信対 [値] => my-emaili-address@gmail.com ）

[1] => Array 
    (
     [name] => Received 
     [value] => by 10.157.39.46 with SMTP id xxxxxxxx;  Mon, 20 Nov 2017 15:59:44 -0800 (PST) 
    ) 

[2] => Array 
    (
     [name] => X-Google-Smtp-Source 
     [value] => [this was a long encoded string] 
    ) 

[3] => Array 
    (
     [name] => X-Received 
     [value] => by xx.xx.xx.xx with SMTP id [an id];  Mon, 20 Nov 2017 15:59:44 -0800 (PST) 
    ) 

[4] => Array 
    (
     [name] => ARC-Seal 
     [value] => [this was a long encoded string] 
    ) 

[5] => Array 
    (
     [name] => ARC-Message-Signature 
     [value] => [this was a long encoded string] 
    ) 

[6] => Array 
    (
     [name] => ARC-Authentication-Results 
     [value] => i=1; mx.google.com;  spf=pass (google.com: domain of xxx@xxxx.com designates xx.xx.xx.xx as permitted sender) smtp.mailfrom=xxx@xxxx.com 
    ) 

[7] => Array 
    (
     [name] => Return-Path 
     [value] => 
    ) 

[8] => Array 
    (
     [name] => Received 
     [value] => from www.xxxxxx.com (xxxxx.com. [xx.xx.xx.xx])  by mx.google.com with ESMTP id xx.xx.xx.xx  for ;  Mon, 20 Nov 2017 15:59:44 -0800 (PST) 
    ) 

[9] => Array 
    (
     [name] => Received-SPF 
     [value] => pass (google.com: domain of xxx@xxxxxxx.com designates xx.xx.xx.xx as permitted sender) client-ip=xx.xx.xx.xx; 
    ) 

[10] => Array 
    (
     [name] => Authentication-Results 
     [value] => mx.google.com;  spf=pass (google.com: domain of xxxx@xxxxxxxxx.com designates xx.xx.xx.xx as permitted sender) smtp.mailfrom=xxx@xxxxx.com 
    ) 

[11] => Array 
    (
     [name] => Received 
     [value] => from www (localhost [xx.xx.xx.xx]) by www.xxxxx.com (Postfix) with ESMTP id xxxxxxxx for ; Mon, 20 Nov 2017 16:59:44 -0700 (MST) 
    ) 

[12] => Array 
    (
     [name] => Message-ID 
     [value] => <xxxxxxx.JavaMail.root@www> 
    ) 

[13] => Array 
    (
     [name] => From 
     [value] => xxxxxxxx 
    ) 

[14] => Array 
    (
     [name] => Mime-Version 
     [value] => 1.0 
    ) 

[15] => Array 
    (
     [name] => Content-Type 
     [value] => multipart/mixed; boundary="----=_Part_xxxxxxxxxx" 
    ) 

[16] => Array 
    (
     [name] => To 
     [value] => xxxx xxxxxxxx 
    ) 

[17] => Array 
    (
     [name] => Subject 
     [value] => xxxxxx 
    ) 

[18] => Array 
    (
     [name] => Date 
     [value] => Mon, 20 Nov 2017 16:59:44 -0700 (MST) 
    ) 

）

Answer 1

Reply-To:電子メールヘッダーは不要です。

存在しない場合、ほとんどの電子メールクライアントはFrom:ヘッダーに戻り、返信先電子メールアドレスとして使用します。