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
Yes, you can split conversations using a regular IMAP-client. Move one of the two messages to a different folder (label) using the IMAP-client and then move it back to the original folder (label).
If you set the draft flag in your external IMAP-client you can also edit the message to add keywords etc.
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.
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.
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 ...
Yes, you can.
If you want to put two e-mails together into a conversation, forward one of the e-mails to yourself using the subject line from the other e-mail.
It's not pretty (it obscures the original sender a bit, as well as the timeline if you do it after other messages in the conversation roll in), but it works.
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 ...
Gmail marks messages as unread, not the whole thread.
Your statement is not completely true indeed: "This solution forces me to read messages in the conversation again to see, what's new".
What realy happens is the following:
when some message(s) in the thread is (are) unread, then it is (they are) shown up at first, while the read ones are collapsed and ...
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 ...
If you receive an email then gmail tries to apply a filter to the incoming message. It will also attach it to a conversation if it can. Unless your filter "archives" the message (which is just the removal of the inbox label) the message/conversation will be shown in the inbox in descending order by time.
An email you send will not generally automatically ...
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 ...