<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>An apple thread suggests</div><div><br></div><div><br><span style="background-color: rgba(255, 255, 255, 0);">Richard, I too was troubled by this until I discovered that under Preferences -> Viewing there is a button that is seem to be checked by default "Include related messages". Uncheck this and all will be back to the way it was before.</span></div><div><br></div><div><br></div><div>Others have reported success w this to the vlad/tim problem<br><div><br></div><div><br></div><br><div>m.c. schraefel, phd., cscs, ceng, fbcs</div><div>@mcphoo</div><div><br></div><div>sent from some glass surfaced device - apologies for weird phrasings that may result</div></div><div><br>On 3 Mar 2015, at 16:06, Tim Chown <<a href="mailto:tjc@ecs.soton.ac.uk">tjc@ecs.soton.ac.uk</a>> wrote:<br><br></div><blockquote type="cite"><div><meta http-equiv="Content-Type" content="text/html charset=utf-8"><div><blockquote type="cite" class=""><div class="">On 2 Mar 2015, at 18:43, Vladimiro Sassone <<a href="mailto:vsassone@soton.ac.uk" class="">vsassone@soton.ac.uk</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">(Even tho this is the list of iOS, not OS X,) Mail.app was fantastic but<br class="">itąs now seriously misbehaving re attachment. Yosemite has forced me to<br class="">use outlook, which is a serious defeat. Itąs sluggish and slow, but at<br class="">least it works.<br class=""><br class="">Mail.app under Yosemite in not slow for me, speed is about the only thing<br class="">that is ok with it. For the rest, it messes up attachments badly (does not<br class="">remove them, when it does might garble the entire message forever). It<br class="">messes up threads, including unrelated messages (that eg may be have a<br class="">similar subject). I have rebuilt the index many times, doesnąt help, the<br class="">only thing that works (till the next attachment is removed, of course) is<br class="">to remove the account altogether and then readd it, so that all messages<br class="">and attachment are downloaded again from the server. Or alternatively, use<br class="">OutlookŠ<br class=""></div></blockquote></div><br class=""><div class="">I see similar things - Mac mail threads mixed up, which means I can no longer ever delete a thread without expanding it for fear of deleting an ‘important’ email.</div><div class=""><br class=""></div><div class="">There’s no apparent pattern. I’d assumed the threading was done by Message-ID and In-Reply-To headers, but that’s clearly not happening here. Mac Mail is trying to be cleverer, somehow. </div><div class=""><br class=""></div><div class="">This article seems relevant. I guess I need to disable View by Conversation, which from an email management efficiency point of view is very bad.</div><div class=""><a href="https://support.apple.com/kb/PH19153?locale=en_US&viewlocale=en_US" class="">https://support.apple.com/kb/PH19153?locale=en_US&viewlocale=en_US</a></div><div class=""><br class=""></div><div class="">Or is there a fix?</div><div class=""><br class=""></div><div class="">Tim</div></div></blockquote></body></html>