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I'm sending some letters to subscribers, and they are chained in Gmail, since subject is the same.

The question is: how can I disable this feature without changing subject and without changing settings in Gmail interface?

Maybe there is specific header I can send, which is respected by Gmail?

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I'm facing the same problem. I've created a contact form in my website, which allows the user to send me an email. If I receive more than one message in one day, even from different senders, Gmail groups them in a thread. I'd love to disable this behaviour for this kind of messages, but so far, I didn't find a way.. – tyron Feb 26 '12 at 1:17
up vote 3 down vote accepted

This feature isn't currently available, but Google has a feature request page where you can suggest it. I just did!

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I don't think you can turn the threading off selectively. From the Conversion view help page:

A conversation will break off into a new thread if the subject line of the conversation is changed, or if the conversation reaches over 100 messages.

If you're so inclined though, you can turn off the Conversation view altogether. That way, you'd see your mail as individual messages.

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