trying to reply to an existing email with gmail API
问题 I'm trying to reply to an existing email with Gmail API: Since I don't have in the existing mail that i want to reply to the headers of References, In-Reply-To then i'm using the Message-ID instead to fill what I'm sending DB5PR03MB1206D3A24F124BDF43A5C6E683D60@DB5PR03MB1206.eurprd03.prod.outlook.com is the Message-ID header of existing mail. I've created the following RFC-802: Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit References: