我正在测试newly announced Google Email Migration API v2。我还没有找到任何方法将电子邮件直接迁移到“All Mail”文件夹（在Gmail中存档）。换句话说，不要在邮件上放置任何标签或收件箱。似乎这可以通过以下请求实现：
POST /upload/email/v2/users/admin@jay.powerposters.org/mail?uploadType=multipart HTTP/1.1
Host: www.googleapis.com
Content-length: 402
Content-type: multipart/related; boundary="part_boundary"
Authorization: Bearer <removed>
--part_boundary
Content-Type: application/json; charset=UTF-8
{
'isInbox': 'false'
}
--part_boundary
Content-Type: message/rfc822
Date: Wed, 03 Jan 2013 02:56:03 -0800
From: admin@example.org
To: liz@example.com
Subject: Hello World!
MIME-Version: 1.0
Content-Type: text/html; charset=windows-1252
Content-transfer-encoding: 8bit
And I think to myself... What a wonderful world!
--part_boundary--
但此消息仍会放入收件箱中。我是否遗漏了其他一些不对邮件应用标签的方法，而不是将其置于收件箱中或者这是一个错误？