When processing multiple input sources, insert a blank line between the input from each source. Ordinarily, the input files are appended one after the other with no delimiters or separators. This is the action selected with the MTA_NOBLANK item code. By specifying the MTA_BLANK action, mtaSend() inserts a blank line between each input file. This is especially useful when the first input file is to be treated as a source of header information and the second as the message body or part thereof. This produces the requisite blank line between the message header and body.
The item_address and item_length fields are ignored for this item code.