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Old 24 Aug 2017, 12:03 AM   #10
SideshowBob
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Join Date: Jan 2017
Posts: 278
If anything I think it confuses things because neither fileinto nor keep are moving or copying, they are both deliveries.

The implicit keep addresses a problem that existed in procmail where mail gets lost if you don't specify what to do with it, sieve avoids this by keeping by default. The copy extension was added because sometimes you want to do something like redirecting everthing to another account which would have the side-effect of removing that safety-net.

From RFC 3894:

"Adding ":copy" to an action suppresses cancellation of the default "inbox" save. It
allows users to add commands to an existing script without changing
the meaning of the rest of the script."
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