Mail: Organize By Conversation - wrong emails

I'm finding in Yosemite Mail that the "Organize By Conversation" view is useless because it is grouping together unrelated emails. I can have two separate threads of email discussion - featuring unconnected contributors - but Mail elects to combine them into a single conversation thread.


How can I stop it doing this?

Posted on Oct 31, 2014 12:08 PM

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Posted on Oct 9, 2017 8:19 AM

Has anyone continued having this problem despite switching Mail software?


My mail is grouped 100% correctly online on Google Mail.

However on all email apps it was mixing up my mail.
I started on Spark then moved to another 3rd party Mail app, then tried Apple's own, and this issue was still there.


It led me to look at what is the constant between all the software. I nailed it down to the system clock.


My system is grouping messages incorrectly because I run my system clock +12mins fast (sounds silly but its beneficial to me to feel like Im constantly late...). So the system time doesnt match the 'real' international time, and it creates a weird vortex of mixing up groupings and email trails in incoming and sent messages on all of the applications.


Reverting my system clock to the 'set time and date automatically' setting resolved the issue across all software.


Hope that helps someone out. Was driving me crazy.

195 replies

Mar 3, 2015 4:20 PM in response to Richard Carr

I had a corrupted Yosemite OS (on a mid-2009 Macbook Pro 13 inch) and Genius Bar had to wipe my machine clean and reinstall the OS on Sunday 3/1 this week. Now, I am experiencing this issue for the first time.


I have 3 different email accounts merged in Mac Mail. One of them is Gmail and the other two are Exchange accounts. I've now seen this happen twice today. Once, it involved emails in the two Exchange accounts. The other time involved emails in the Gmail and one exchange account.


Changing the settings to not include related messages DOES NOT fix the problem. I hate the option of viewing emails without the conversation context. I followed another users recommendations to add those buttons to my toolbar so I can easily turn them on/off, but that's not a fix at all.


I'm now paranoid of moving email into the wrong account folders ... mixing emails between different organizations that I work with. It's a security risk!


HELP, Apple!


I really just don't even like Mac Mail anyway ... clunky, difficult to use, missing functionality. This 'new' bug just might drive me to finally abandon Mac Mail. Anyone have suggestions for better applications to manage multiple email accounts (yes, including Gmail) on my Macbook pro?


Thank you!

Mar 3, 2015 7:50 PM in response to HRPevergreen

One more voice to add to the clamor: I have never had a problem like this until I upgraded my home computer to Yosemite 2 weeks ago. Now I'm seeing this random grouping of unrelated messages into conversations on all of my computers accessing my work email account, including work computers that have not been upgraded and are still running Mavericks. The work account is an Office365 Exchange account. I have tried rebuilding the mailbox and checking and unchecking the "related items" box without effect. This is a major problem for keeping track of work emails -- I really need to be able to see messages by conversation but if the messages are lumped into the wrong conversations like this MacMail is pretty close to unusable for me. As much as I really hate Outlook, it looks I may be moving that direction.

Mar 5, 2015 4:41 AM in response to philliprodo

One other thing. I saw a reference in another thread about using the Classic Layout. When you enable Classic Layout in the Preferences/View, the conversations are organized and displayed properly. The only drawback is that now the display is split in two frames horizontally instead of vertically with the top frame displaying the message headers, while the message viewer is shown on the bottom frame. That's a small price, given that now the conversations are grouped properly.


Try this, it may fix your problems, at least it has in my case.


thank's ... I hadn't even seen that option 😊 sadly some messages are still in the wrong conversations... oh, well at least I got the classic layout back.


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Mar 6, 2015 10:18 AM in response to Richard Carr

Same issue, another symptom. Using Apple Mail 8.2 and OS X 10.10.2. Our schools is using Google enterprise and Apple Mail as client.


I started a new mail to a Colleague A - it automatically saves into drafts. I did not finish it and I did not send it. During the time the message sits in Drafts, Colleague A sent me an unrelated email. Result:


- Apple mail combines my draft message with the raw code of email from Colleague A

- the combined mail appears in my Inbox with me as a Sender and Colleague A as a recipient

- Apple Mail acts as if Colleague A never sent a message even though online Gmail and all other mail clients display this correctly (Airmail 2, Sparrow, Postbox, etc.)

- And on a serious security note—if he adds an attachment of a config profile for access to our networks (example), the raw code shows all details of the config profile (network name, network password, etc.)


It is a mess.

Mar 11, 2015 1:06 PM in response to Richard Carr

To shed what may be some additional light on this, I'm using Yosemite (10.10.2); my wife has Mountain Lion (10.8.5). We have both been a part of two separate email chains - one from a group of friends, and one from our insurance agent. There is no commonality among the distribution lists, subjects, or message content. Both my wife and I have these lumped together in the same conversation. So it's not just a Yosemite problem, and it seems to be more than just an isolated issue.

Mar 11, 2015 3:44 PM in response to Richard Carr

Sorry if this has been posted before (I did not read all 10 pages) but I noticed if I click on a folder (or Inbox), go to the "Mailbox" menu then pick "Rebuild" it will re-pull the emails from the server (hence rebuild) and fix the conversations. For me, new emails break things again but at least the old ones seem to be staying put.


I am doing this with an Exchange account.

Mar 12, 2015 6:13 AM in response to hadfiiw

I tried "rebuilding" conversations, but it did not work: still a long thread of 281 emails crammed together without any rhyme or reason.


The one common denominator I see is that some of the emails threaded together have people listed with emails addresses from a single organization (although for very different topics and discussions)... as you can imagine this is a major problem working in a large academic environment -or for that any professional practice. Many of my emails are with the same collaborators, but I don't work on a single project. Email might be trying to be overly smart by putting all the emails with the same domain within a single thread but the results are disastrous.

Mar 16, 2015 5:11 AM in response to Richard Carr

Just here to stand in the crowd. Neither reindexing, -building nor toggling views does anything to solve this problem for me. I want to add that I am experiencing this with a third-party IMAP server, not Gmail.


I guess I will look into some other mail app, but the fact that it needs to come to this is absolutely laughable. It's email. It's almost antiquated. Imagine Sony no longer being able to manufacture a working VHS recorder.

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Mail: Organize By Conversation - wrong emails

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