The /16 function code
internally executes /OS00, i.e. it opens a new mode and then uses the
"S00" function to create and send the document.
You have two
options: Either use Enter /NS00 instead of Enter /16 in your InputScript, create
and send the document and then return to the Business Workplace with /NSBWP. Or
use Enter /OS00 process="mysendemail.txt" which opens the new mode and
starts a new InputScript "mysendemail.txt" in this mode.