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5711abdee5
Hardening of POP3 and SMTP communication: SMTP: Decrement failure counter when no possible message send occurred. This way, K-9 will only stop attempting to send messages for which a possible successful send occurred, but K-9 could not detect. Any message that is known to have completely failed to send will be reattempted indefinitely. POP3: Some reworking of Exception handling. Also, if it is not possible to get a "message number" for the UID of the message that is being deleted, conclude that the message has already been deleted on the server. Mark this as a permanent error, so that it gets removed from the pending actions queue. MessagingController: Look for the permanentFailure flag on the MessagingException, and if a pending action raised a permanent failure, remove the pending action from the queue so that it will not be re-attempted nor block later requests.