[Re-sending; forgot to CC the bug in private reply. Then I'll shut up.]
I wrote:
A cursory look at rfc3463 suggests these error codes: 523 Message length exceeds administrative limit 534 Message too big for system
Too cursory; those are status codes (and also need to be dotted). The best error code (from RFC 2821) is probably:
552 Requested mail action aborted: exceeded storage allocation
Combining the two (via RFC 2034) gives something like:
552-5.2.3 Message too long for <[EMAIL PROTECTED]>; 552 5.2.3 the maximum size allowed is X.
(If the list software is only called after the smtp session has accepted the message, the restriction would have to be implemented directly in the MTA configuration in order to be able to provide feedback without becoming a "recognised"[0] spam source.)
[0] http://www.spamcop.net/fom-serve/cache/329.html
-- Marco
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