Wez Furlong
992ffbd470
Following on from b64219bab4, if we
do encounter a 354 response to a message send, it must indicate
a protocol synchronization issue, so let's treat the associated
message as it had transiently failed and explicitly break the
connection (like we do for a 421).
I did consider making the associated message immediately eligible
to retry, but I worry that if that particular message is a poison
pill we might get stuck in a short cycle of retries for it.
I don't think it is likely for this particular message to be the
poison pill, because it is most likely the victim of an earlier
issue on the connection, but I still want to be cautious here.
The outcome here is still not ideal, but it is better than marking
the associated message as a permanent failure.
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