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On Mon, Sep 23, 2019 at 12:53 PM, David Grimm wrote:

How did this happen? Just had someone post a reply to a message in a topic I locked a month ago.?

David -- The answer to your question is actually quite involved, but the bottom line is that "subject lines" and "topics" are not the same thing. In groups.io, a "subject line" is a string of characters, while a "topic" is just a number. Topics can be locked, but subject lines cannot. How a message gets assigned to a topic depends on when it is posted, and whether it comes in via email or online, in addition to whether it shares the same subject line.

For example, let's say that someone in your group started a topic with the subject line of "Hello." For whatever reason, at some point you lock that topic. Is it your intent that every message with "Hello" in the subject line will forever after be rejected, until the end of time? Such an algorithm for message threading would soon create its own problems.

If an incoming email contains threading information ("reply-to" info in the header), this can still be used to head things off. If not, the groups.io threading algorithm looks for a post with a "matching" subject line over the past 2 days (30 days if the subject line begins with "Re:" or other known reply indicator). If it finds none, an email with no reply-to information starts its own topic. The assumption here is that although the new message may have the same subject line as a previous topic -- locked or not -- this was probably just a coincidence.

Online, things are different, although not necessarily more straightforward. If you're reading a message in a locked topic online, there is no Reply button. But it is possible to "reply" to a locked topic online using the New Topic button, followed by entering the same subject line as the existing message. In that case, groups.io assumes the subscriber is actually starting a new topic because, well, he clicked on a button that said so.?

More details at?/g/GroupManagersForum/wiki/Avoiding-threading-topics---threading-algorithm

Hope this helps,
Bruce
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