We (Streak) just added the ability to split up threads into smaller ones by selecting messages you want to move to a new thread. If you're still looking for this feature it may be helpful: https://www.streak.com/split-gmail-conversation-threads-break
There are headers in an email message which contain information about which thread the email message belongs to. I don't know for sure that Gmail uses these headers, but I would be very surprised if it didn't. You can see the headers of an email message in Gmail.com by clicking the three dots and then "Show original".
If those headers don't exist, I presume ...
Replies to emails and forwards of emails make up conversations.
When a subject is changed, that breaks the conversation.
For some reason, e-mails with the same title may get grouped into a conversation.
However, there isn't a way that I know of to group individual emails into a conversation.
In Gmail "Email threads" are named "conversations".
Gmail search doesn't have operators to find conversations where last reply meet certain criteria. You could use filters, but they should set before receiving that replies.
Instead, implement a email management workflow. The simplest principle is to archive all the conversations that doesn't require a ...
There is an icon "Forward All" in Gmail which can achieve this:-
Needless to say, this option is only visible when a conversation has more than 1 email.
However, this clubs all the attachments of different emails within the conversation together as essentially you are the one sending a single email, so you may need to mention who sent what ...
There has got to be a better way, but I've found a clunky work-around. Sharing it here in case others have the same problem I do.
go to settings (the gear icon) and turn conversation view off,
then save changes
search for "in:trash from:me"
select all the
individual messages you want to save (they are already invisibly part
of 'Sent' we just want to keep ...
In Gmail, enable IMAP in Settings » Forwarding and POP/IMAP.
Install Thunderbird, and configure the Gmail account using IMAP.
In Thunderbird, right-click on email to forward, and choose Edit as New Message.
Address the message, and Send.
Repeat steps 3-4.
Also try IFTTT.
This allows you to set up triggers that cause actions for all sorts of things that happen on the internet. In this case, you can automatically forward the email with the date received added to the subject thereby creating a new conversation for each email.
Sadly, gmail won't forward to an arbitrary email address so it's probably not ...