Thanks to Victor Hooi for the bug report, and Serhiy Storchaka for the initial patch.

Also some other consistency tweaks.

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.

locale, so an additional check is required.