Gmail – Recognize Threads with Non-English Reply Prefixes

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In Gmail, when I receive a reply to a message with Subject: X, and the reply has Subject: Re: X, it correctly recognises it as a reply and sorts the message in the same thread/conversation.

However, if the reply has a subject Aw: X or Sv: X, as may happen when people use non-English e-mail clients, Gmail appears to not recognise the message as part of the conversation.

Is it possible to tune or configure Gmail to make it understand non-English reply prefixes?

If so, how?

Best Answer

It should be using the References: header of the email messages. However, not all email clients provide a correct References header. There is nothing you can do about Gmail's processing of the mail headers.

Some references: