Validate @recipients before using it for sendmail and Net::SMTP. Ensure that @recipients is only raw addresses when it is handed to the sendmail binary OR Net::SMTP, otherwise BCC cases might get an extra <, or wierd stuff might be passed to the exec. Signed-off-by: Robin H. Johnson <robbat2@gentoo.org> Signed-off-by: Junio C Hamano <junkio@cox.net>