I have changed the qmhandle script to use qmailctrl instead:
# While this is if you have a Debian GNU/Linux with its qmail package
#my ($stopqmail) = '/etc/init.d/qmail stop';
#my ($startqmail) = '/etc/init.d/qmail start';
my ($stopqmail) = 'qmailctrl stop';
my ($startqmail) = 'qmailctrl start';
Hopefully, this will work next time I delete an email using qmhandle!
Regards,
Mon