<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><blockquote type="cite" class=""><div class="">On Feb 6, 2017, at 4:28 PM, Daniel Duan via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">I’ve been wondering about this for a while. What heuristic does mailman use to group emails? It this really impossible even if the title, email body, recipient all fits as if it’s from a existing subscriber?</div></div></blockquote><div class=""><br class=""></div><div class="">This email is related to the thread only by the subject. How does it work in your email client? I just wrote a new message, no “reply to”, etc.</div><br class=""><blockquote type="cite" class=""><div class=""><div class="" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div class=""><br class=""><div class=""><blockquote type="cite" class=""><div class="">On Feb 6, 2017, at 4:12 PM, Xiaodi Wu <<a href="mailto:xiaodi.wu@gmail.com" class="">xiaodi.wu@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">No, as you define it, they're not mutually exclusive. But maintaining the option to reply to a thread at an indeterminate point in the future when you finally get around to reading _is_ essentially mutually exclusive to not storing a copy of every email sent to the mailing list on your email account somewhere.<br class=""><br class=""></div></blockquote></div></div></div></div></blockquote><br class=""><div class=""><br class=""></div><div class=""><br class=""></div></body></html>