Ben Kennedy writes:
Specifically, why is Courier accepting hundreds of megabytes for an hour before issuing the 523 message? Unfortunately there is no message size being communicated in the MAIL FROM conversation (I can see this from my packet capture) so Courier has no basis to immediately reject the attempt. However, it seems reasonable that it should terminate the session after a prerequisite time has elapsed or the threshold number of bytes have been received. This doesn't appear to be happening.Any comments or suggestions, anyone?
If Courier would do that, there's a far greater possibility that a broken SMTP client would interpret a rude socket teardown of this kind as a temporary error, which calls for an immediate retry.
Try blacklisting their return address with badfrom in bofh. This will result in their MAIL FROM getting an error back, which should hopefully share Outlook loose out of its stupor.
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