Hi, Hi, I tried to send an email to the following address (example only), but it bounced back with the following error msg in Postfix mail server. The postfix mail log said that, to=<anbc at roosf.com.au>, relay=10.1.131.4[10.1.131.4], delay=1, status=bounced (host 10.1.131.4[10.1.131.4] said: 550 DNS Blacklist (in reply to RCPT TO command)) What is this means? Thanks S