Addresses the remaining feature request from issue #2489.

return a returncode of 0 when the child has already exited or cannot be
waited on.

to return a returncode of 0 when the child has already exited or cannot be
waited on.

to return a returncode of 0 when the child has already exited or cannot
be waited on.

Also made the smtplib markup consistent with the rest of the markup.

Also made the smtplib markup consistent with the rest of the markup.