$author = $author || 'Proxmox VE';
- open (MAIL, "|-", "sendmail", "-B", "8BITMIME", "-f", $mailfrom, @$mailto) ||
+ open (MAIL, "|-", "sendmail", "-B", "8BITMIME", "-f", $mailfrom, "--", @$mailto) ||
die "unable to open 'sendmail' - $!";
# multipart spec see https://www.ietf.org/rfc/rfc1521.txt