0.0.0.0/8	REJECT Domain MX in broadcast network (smtpd_sender_restrictions #001)
10.0.0.0/8	REJECT Domain MX in RFC 1918 private network (smtpd_sender_restrictions #002)
127.0.0.0/8	REJECT Domain MX in loopback network (smtpd_sender_restrictions #003)
169.254.0.0/16	REJECT Domain MX in link local network (smtpd_sender_restrictions #004)
172.16.0.0/12	REJECT Domain MX in RFC 1918 private network (smtpd_sender_restrictions #005)
192.0.2.0/24	REJECT Domain MX in TEST-NET network (smtpd_sender_restrictions #006)
192.168.0/16	REJECT Domain MX in RFC 1918 private network (smtpd_sender_restrictions #007)
224.0.0.0/4	REJECT Domain MX in class D multicast network (smtpd_sender_restrictions #008)
240.0.0.0/5	REJECT Domain MX in class E reserved network (smtpd_sender_restrictions #009)
248.0.0.0/5	REJECT Domain MX in reserved network	(smtpd_sender_restrictions #010)