Reply to GmailThread

Question

Say my address is [e-mail] , and I have this thread in gmail:

 Thread1 ======= Email1 From: [e-mail] To: [e-mail] Content: Hello, I have a question about your product. Email2 From: [e-mail] To: [e-mail] Content: We have received your email, we will answer soon. 

When using this Javascript code in Google Apps Script using the reply GmailThread method:

 var threads = GmailApp.search(...); var thread = threads[0]; // this is our Thread1 thread.reply(body, {htmlBody: htmlbody, from: " [e-mail] "}); 

it will actually answer me! (ie email from yourself to the email address from the email itself @@@ [e-mail] )

In fact, the dock says:

answer (body)
Reply to the sender of the last message in this thread

How to avoid this when using GmailThread and have a reply reply to the original author?

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Note. This can be tricky, because sometimes Gmail “groups” in the same thread chains that are not between the same two people. So, for example, if there was mail a month before, with the same question:

 Email0 From: [e-mail] To: [e-mail] Content: Hello you. 

then it will be grouped in the same gmail stream ! This means that we cannot use this simple solution: "let's use From first message in the stream."