MIME标头无法通过Gmail API进行

Question

我正在尝试通过Gmail API自动创建草稿，我希望这些草稿是对现有电子邮件的回复。为此，我相信我需要设置“ threadId”标头（特定于Gmail），“ References”标头和“ In-Reply-To”标头。此外，为使Gmail认为该邮件是答复，“主题”标头必须与原始电子邮件匹配。

我将所有这些标头硬编码为MIMEText对象，然后将邮件作为字符串进行base-64编码（urlsafe），并让Gmail API传递。但是，“ threadId”，“ In-Reply-To”和“ References”标头似乎从未出现在发送的电子邮件中，因为在单击“显示原始”时显示的MIME中不存在这些标头。在Gmail用户界面中。

new = MIMEText("reply body text")
new["In-Reply-To"] = "[Message-ID of email to reply to]" #looks like <[email protected]>
new["References"] = "[Message-ID of email to reply to]" #looks like <[email protected]>
new["threadId"] = "[threadId of message to reply to]" #looks like 14ec476abbce3421
new["Subject"] = "Testsend2"
new["To"] = "[Email to send to]"
new["From"] = "[Email to send from]"

messageToDraft = {'raw': base64.urlsafe_b64encode(new.as_string())}
message = {'message': messageToDraft}
draft = service.users().drafts().create(userId="me", body=message).execute()

Answer 1

实际上，比这简单得多！如果您仅在标题中提供正确的Subject，在正文中提供正确的threadId，则Google会为您计算所有引用。

new = MIMEText("This is the placeholder draft message text.")
new["Subject"] = "Example Mail"
new["To"] = "[email protected]"
new["From"] = "[email protected]"

raw = base64.urlsafe_b64encode(new.as_string())
message = {'message': {'raw': raw, 'threadId': "14ec598be7f25362"}}
draft = service.users().drafts().create(userId="me", body=message).execute()

这将产生草稿，可以在正确的线程中发送：

然后，我发送邮件。如您所见，引用是为您计算的：

MIME-Version: 1.0
Received: by 10.28.130.132 with HTTP; Sat, 25 Jul 2015 07:54:12 -0700 (PDT)
In-Reply-To: <CADsZLRz5jWF5h=[e-mail]>
References: <[e-mail]>
    <CADsZLRz5jWF5h=[e-mail]>
Date: Sat, 25 Jul 2015 16:54:12 +0200
Delivered-To: [email protected]
Message-ID: <CADsZLRxuyFhuGNPwjRrfFVQ0_2MxO=[e-mail]>
Subject: Example Mail
From: Emil Tholin <[email protected]>
To: Emil Tholin <[email protected]>
Content-Type: text/plain; charset=UTF-8

This is the placeholder draft message text.

Answer 2

如果您不仅要创建草稿，还要发送它，然后再扩展上述代码（在草稿= ... create（）。execute（）之后的另一行：

    draft = service.users().drafts().create(userId="me", body= message).execute()
    message = service.users().drafts().send(userId='me', body={'id': draft['id']}).execute()