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I am running a small server on a LAN and do not expect more than a couple dozen emails an hour or so. A user on the LAN accidentally set off a few thousand emails at once. Is there a tool or setting (using exim4, but any popular open source MTA available on Ubuntu will do) that could temporarily block such episodes or at least send a notification so that the excitement can be contained?

Nothing came up in a quick search, so even useful search terms would be helpful as an answer.

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up vote 1 down vote accepted

For exim4, you're looking for ACL ratelimit settings (although some mailers put it under 'policy')

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