Sending alert to client after quota has reached 100%

[Dan Conway]

Hello all, I hope you are doing well.

In regards to the quota_warning configuration, more specifically when an 
email is sent to the user when quota has passed a certain percentage, i.e.:

quota_warning = <limit configuration> <quota-warning socket name> <parameters>
#quota_warning2 = ...
#quota_warning3 = ..etc..

Is it possible to communicate with the client by sending an ALERT IMAP 
message to stdout much like post-login scripting, rather than sending an 
email to the user?

i.e:

#!/bin/sh

# Message goes to stdout
printf "* OK [ALERT] This is an alert\r\n"
exec "$@"

Thank you.

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