In our setup we do quite a bit of work with MD in rewriting our headers, as a way of masking domains that we use only internally. One of the effects of this is that when the rewriting is done, a message with multiple recipients is generally broken apart at the time of rewriting, so that there is one copy of the message per addressee.
Where we're having occasional problems is when we have users who do large personal mailings, sometimes as many as 400 or 500 recipients on a single message. When this happens, it makes a major hit on server performance. A similar difficulty we had a couple of weeks ago is a user that sent a message to only about 75 addressees, but each copy of the message had a 3 1/2 MB attachment. That one brought the server to its knees, and I believe that we eventually had to reboot to get sendmail and MD totally cleared.
I don't admin that server directly, so I don't have a better detail of the exact symptoms of what all went wrong.
What I want to find out about is how we can do a better job of filtering by size -- is that something to do in sendmail directly, or something to do with MIMEDefang?
Specifically, there's a couple of things we would like to be doing:
1) Set a simple maximum number of recipients that a message can show in either To: or Cc: lines.
2) Set a "maximum batch size" -- essentially the product of size of messages and number of addressees. A short message (e.g. 5K) with a larger number of addressees is less of a problem than a longer message (e.g., several hundred KB) with fewer addressees.
Thanks in advance for responses.
Smith
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