nq_ctx

Pointer to an enqueue context created with mtaEnqueueStart().

to_adr

An address to add to the message being enqueued. The address must be compliant with RFC 2822. When used as an envelope address, the MTA will reduce it to an RFC 2821 compliant transport address. If a value of zero is passed for to_adr_len the address string must be NULL terminated. The length of this string, not including any NULL terminator, may not exceed ALFA_SIZE bytes.

to_adr_len

The length in bytes, not including any NULL terminator, of the address supplied with to_adr. If a value of zero is passed for this argument, then the address string must be NULL terminated.

item_code

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