Yosemite - Mail grouping unrelated messages from same sender

I am also having this issue.. Hide Related does not help unless you have messages in other folders, then those messages will be hidden. I also wrote to apple support about this and am hoping for a solution. I have more than 4 conversations with different subjects linked into 1 with over 175 messages.. It is very frustrating. I did notice this happened a little with Mavericks, but it was no more than 2 conversations and would not be too bad. But now I have 3 months or unrelated conversations linked and it is tedious to find the right message/subject this way.

A very quick solution that I have found and which works is to Mailbox>Rebuild the mailbox(es) that has this issue. Everything has worked fine after that

I have done that. It doesn't work. You will see the problem at some point again.

Have done that too. Doesn't help unfortunately. Once all accounts are completely rebuild the same problem occurs...

To throw more information into this.. I've noticed the problem now occurring across different email accounts.. with different subjects.. about completely different things!

I'm back to having grouping turned off, and my email productivity is going to complete ****. For the first time - I'm definitely considering moving away from Apple Mail to something else.

Postbox seems a good shout. It's paid for but ****, if it sorts this problem out I couldn't care!

Gonna go whine at Apple again now. They need to know how much their sh*t is f*cking people up who have chosen to depend on their software.

Anybody got any news after the update to 10.10.2 ?

I hoped the problem would be resolved with this update as many sources stated that there will be improvements with MAIL.

I am still having the same issues though.

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Same thing is happening to me.

Have a conversation thread of over 400 messages, grouping about 30 different (and entirely unrelated) threads from 3 different email accounts.

Incredibly annoying. Have also send the bug report to apple.

Yes, I was also hoping that the 10.10.2 update would address the Mail conversations view problem. Alas, no.

I switched to IOS because of Microsoft's upgrade miracles (break what works well) , I'm getting a deja vu and I don't like it a bit

I am also seeing this issue on Yosemite 10.10.1. I have rebuilt the Mailbox with no effect. The mailbox is on an Exchange server, though I have other gmail mailboxes set up, and a yahoo mailbox too.

Haven't made a request of Apple yet, but I'll do that too.

uncheck "organize by conversation" in view menu, then everything goes back to old fashion--mails no longer organized by thread. It is not that convenient but you won't miss mails.

I'm having the same problem. Using Gmail account - sometimes completely different emails with different topics etc get grouped together. I'm looking forward to a solution Apple!!!

/Kristian

This seems to have worked for me. Thanks!

My incoherently grouped conversations seem to include some messages with email header like:

Mail/View/Messages/AllHeaders give me one of these:

References: <E27BEF97BB67EB46B6D827165C888CB3623A1636@mboxes2.campus.vims.edu>

<,<BABD1BF0F5F0E4468CD18153E6B81D84622369B9@mboxes2.campus.vims.edu> <>>

<E27BEF97BB67EB46B6D827165C888CB3623A16F7@mboxes2.campus.vims.edu>

<,<643C1D83-0623-420F-8EE3-A7BC1645E401@vims.edu>>

I think it might be grouping threads together based on the threads containing a message with '<>' as a null reference.

This is how I fixed the grouping issue : https://nisalm21.wordpress.com/2015/01/02/apple-mail-app-you-alright-mate/

Hope this helps