Mac OS X Server 10.6: accept mails with empty subject line
If you use Mac OS X Server 10.6 (Snow Leopard Server) as a mail server, by default it rejects mails without a subject line.
If you want to change this behavior, you just need to open the file /etc/postfix/main.cf and change the line
header_checks = pcre:/etc/postfix/custom_header_checks
to
# header_checks = pcre:/etc/postfix/custom_header_checks
Afterwards, type
sudo postfix reload
to
