How to limit mail size of outgoing messages per domain/user

Hello,
i want to limit the size of a mail a user can send. For inbound mail there are attributes in the directory service: mailDomainMsgMaxBlocks and mailMsgMaxBlocks.
But these limitations only enforce the size of incoming mail.
I've read the messaging server admin guide but all i could find out is that i could limit the size of outgoing mail via a channel.
For me this solution ist not granular enough. I want to set the outgoing mail size limit per user. Furthermore i don't know the impact of configuring 200+ channels for enforcing individual outgoing mail size limits per hosted domain.
Does anybody know a solution for this problem? Maybe i've read over something. Or can anybody tell me the performance impact of 200+ channels at least?
Thank you very much,
af_inet
JES 2005Q1, Solaris10, V440

Hi jay_plesset,
thanks a lot for your clarifications.
Why would you need 200 channels? That sounds like a
very strange setup. Setting outbound max size per
user sounds like a very unusual demand, too.Let me explain: I got several departments who control their email settings in the messaging server via a webapp. So they can add, delete and modify users. They can manage mailing lists and so on. It's really a cool tool :-) I want this thing to be as granular as an own mailserver for the department would be. So it would be cool when the webapp writes an attribute like maxMsgBlocks in the DS and the thing is done.
I don't understand why you guys could do the stuff for inbound but not for outbound. Is there a technical reason or is it just because it seems strange? :-)
If you REALLY need something like that, 200 channels
would need a POOL of at least 200 jobs in order to
reliably run, and that's likely to need lots of
system memory.I think that's not the way i want to go.
Consider a custom channel, or something like that,
that does an LDAP lookup for setting message size on
sending. You'd need to enforce smtp authentication,
so you know who your messages are coming from, first,
and then you could proceed from there. This is not a
trivial setup.Sounds interesting. Any documentation hints for custom channels?
Thanks again for your reply,
af_inet

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