Since version 16, I let my list owners do it themselves ("it" being "delete
a posted message from the archives").

On list home page, click the message
​ log​
  of interest.  Now you see a row for each message in the log.  On  the
right
​of​
each row is a trash can.  Click the trash can to remove the message from
the log.

Cheers, Wayne

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