At 09:50 6/2/2004, you wrote:
>Doing this in online SMTP is impossible. The step that goes from the SMTP
>session to the message delivery is definitely not atomic. It'd be possible
>to reject the message at mailbox delivery time, by sending a notification
>message to the sender. Considering everything, I think this is going to
>stay as is.

Would it not be possible to reject at the post-data filter stage? Since the 
message is, essentially, complete at that point, a post-data filter could 
check the size of the message - although checking the available space in 
the mailbox might be a bit more problematical.... 

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