PHP邮件收件箱（IMAP）如何在PHP（Laravel）上对每个会话邮件收件箱进行分组？

I had a problem with grouping message for reply so we can see history of conversation. Is there a way for grouping it? variable that I can get from imap:

1. id
2. date
3. subject
4. fromName
5. fromAddress
6. to
7. toString
8. cc
9. replyTo
10. messageId
11. textPlain
12. textHtml

Did I just need to store it to my DB and groupby it by fromAddress and subject? but subject for reply is "Re: subject", right?