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Threading Topics and the Threading Algorithm

Posting by email with the same subject text causes them to thread together.

If you post from your group's home page, just use New Topic (as opposed to Reply) if you wish to create a new thread.

Here is the threading algorithm:

If a message has threading information (i.e.: "References" and "In-Reply-To" entries in the message header), use that.

If a message does not have threading information:

  • If it's a web post (i.e.: not a reply), assume it's the start of a new thread
  • If the subject starts with Re:, look for a matching subject within the last 30 days
  • If the subject does not start with Re:, look for a matching subject within the last 2 days


Workaround for mail:

If posting by web is too inconvenient, your other option would be to vary the subject text slightly. Perhaps add the day of the week to the subject text, or something else to prevent each from being identical to another posted within the algorithm's date range.

Reminder -- if you are a Moderator, you can also split off messages. See the separate wiki page on that.

Updated:  2019-01-09