dq_ctx

A dequeue context created by mtaDequeueStart().

env_to

The recipient address to effect the setting for. This must be the recipient’s envelope To: address as returned by mtaDequeueRecipientNext() and not some transformation of that address. If a value of zero is passed for the env_to_len argument, then this string must be NULL terminated.

env_to_len

The length in bytes of the recipient address, env_to. This length does not include any NULL terminator. If a value of zero is passed for this argument, then the recipient address string must be NULL terminated.

disposition

The delivery status disposition to set for this recipient address. See the description section that follows for further details. 

item_code

An optional list of item codes. See the description section that follows for a list of item codes. The list must be terminated with an integer argument with value 0.