Script Runtime errors via X-Headers

Hi,

recently I stumbled upon a server, which returns run time errors of a 
sieve script as an X-Header. I did not find any documentation regarding 
this behavior, so I think it non standard. Never the less it's quite 
handy. Especially if you move, rename or misspell an imap folder.

Such an error X-Header looks like this:
X-Nemesis-Sieve: missing mailbox "\example"

Is there a chance to standardize this within the Sieve RFCs? It makes 
debugging script for inexperienced users with no access to the server 
logs way easier.

Especially since Paragraph "2.10.6. Errors" of "rfc5228" requires 
implementation to represent script errors to the user but does not offer 
any suggestions how to do that.

Thus I would suggest adding the following to paragraph 2.10.6 :

    When an error happens, implementations MUST notify the user that an
    error occurred and which actions (if any) were taken, and do an
    implicit keep.

+  This can be achieved by adding an "X-Sieve-Error" header containing
+  the runtime error message to the mail.

What are your thought on that?

Regards

Thomas Schmid

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