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

Feb 12, 2015 8:45 AM in response to Richard Carr

Exactly the same issue, a thread appears with perhaps 3 totally unconnected people - god knows what mail is using to link them - there must be something but it ain't right!


I trashed hundreds of old mails - thinning out everything considerably, rebuilt mailboxes and eventually deleted prefs.plist. Everything was perfect for a few days then suddenly crazy conversations appeared.


One word of caution on the plist delete. Mail initially failed to create a new plist file on reboot and everything went haywire. Did a complete restart and pram zap and then all was good.

Feb 16, 2015 1:42 PM in response to Richard Carr

You can count me as another effected user. I have this merging of unrelated messages happening in my inbox as well as my archive. You'll very clearly see two email sets of email with clearly different subjects merged into one thread.


The account I'm having a problem with is my IMAP account from work. My various gmail account all seem to be fine, but I haven't investigating them as in depth.

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Mail: Organize By Conversation - wrong emails

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