Echo notifies when users manually archive discussions. It should not be sending out mention notifications if there is not a ''new'' timestamp (within a few seconds) added to the discussion. Please see http://en.wikipedia.org/wiki/User_talk:Equazcion/OneClickArchiver#Echo and the example linked in http://en.wikipedia.org/w/index.php?diff=635909103
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Indeed, new text has always been checked only for the "identification" part in the signature, regardless of the timestamp:
Help:Notifications/Mention § How to mention another editor and trigger a notification
Sign your comment with ~~~ or ~~~~.
So if a user archives a section with their own comment AND they mention another user AND their signature has not changed since, it will send a notification to whoever they mentioned.
Note that this request is the exact opposite of what T66778: Echo: Remove the signature-requirement for Mention notifications is asking for.