Sending alert through IMAP?

[BQ]

Hi,

This question is a bit off topic, but I hope someone can sched some
light on this.

In rare circumstances, we need to send message to all our users.
Usually we post a notice on the webmail web site, but the problem is
with users which use their MUAs with IMAP4 clients.

As almost all clients nicely show a popup when the user is over quota,
I was wondering if we can use the same mechanism to send arbitrary
messages to clients?

Thanks for help,

BQ

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