Sorry for the missing details: I have added this to the default line in main.cf:
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 hash:/etc/postfix/SMTP_allow.txt then run the command postmap SMTP_allow.txt (created the db file) postfix reload -- Sent from: http://postfix.1071664.n5.nabble.com/Postfix-Users-f2.html