Updating destination list delivery server has failed
The outbound connection was established, but was unable to complete the message transaction, either because of time-out, or inadequate connection quality.This is useful only as a persistent transient error.The message was accepted for relay/delivery, but the requested priority (possibly the implied default) was not honoured.The human readable text after the status code contains the new priority, followed by SP (space) and explanatory human readable text.
This is useful for both permanent and persistent transient errors.
More recipients were specified for the message than could have been delivered by the protocol.
This error should normally result in the segmentation of the message into two, the remainder of the recipients to be delivered on a subsequent delivery attempt.
The mailbox is full because the user has exceeded a per-mailbox administrative quota or physical capacity.
The general semantics implies that the recipient can delete messages to make more space available.Both the sender and recipient must permit the exchange of messages and arrange the exchange of necessary keys and certificates for cryptographic operations.