GMail IMAP - How to get conversations (threads) list?

Question

I am trying create similar view like in GMail. I know that GMail IMAP have extension X-GM-THRID which I can use in FETCH command, but this return me this same numbers of items and I must group them manually by thread ID. Exists any faster way to group this? I am mean, can google imap server return me list of messages grouped by thread id (like in gmail web interface)? To be more specific:

If I have this list (THREAD ID | TEXT)

• 12345 "hello"
• 12345 "hi"
• 12345 "what's up?"
• 67890 "are you there?"
• 67890 "no, I'm not"

I want get from server only:

• 12345 "hello"
• 67890 "are you there?"

Can I do that? Finally, I would have to group this by my self, but this solution is inefficient and slow (I have many messages to group)

Regards and sorry for my English.

Answer 1

The 'In-Reply-To' header of the child should have the value of the Message-Id header of the parent.

There is one another field in header 'References' which contains message ids of all its parent.

you can user either of them as per your requirement.