0

Normal, successful completion. 

MTA_BADARGS

A NULL value was supplied for the dq_ctx call argument, or an invalid dequeue context was supplied for dq_ctx.

MTA_ORDER

Call made out of sequence. The call was made either before the recipient list has been exhausted with mtaDequeueRecipientNext(), or after the message had been dequeued or deferred with mtaDequeueMessageFinish().

MTA_THREAD

The MTA SDK detected simultaneous use of the dequeue context by two different threads.