When the remote site attempts to deliver it is caught in blocklist: Sep 28 05:29:50 mx10 postfix/postscreen[15338]: NOQUEUE: reject: RCPT from [210.44.128.104]:33372: 550 5.7.1 Service unavailable; client [210.44.128.104] blocked using b.barracudacentral.org; from=<sheryl.s...@sdufe.edu.cn>, to=<john...@example.com>, proto=ESMTP, helo=<sdfi.edu.cn>
I already have this: # grep postscreen /etc/postfix/main.cf postscreen_dnsbl_action = enforce postscreen_greet_action = enforce postscreen_dnsbl_threshold = 2 postscreen_dnsbl_sites = licensekey.zen.dq.spamhaus.net*2, b.barracudacentral.org*2, bl.spamcop.net*1 postscreen_access_list = cidr:/etc/postfix/postscreen_access, permit_mynetworks postscreen_dnsbl_reply_map = texthash:/etc/postfix/dnsbl_reply # cat postscreen_access 210.44.128.104 PERMIT Is 'postscreen_blacklist_action = enforce' the missing link to whitelist it? I'd like to have some confidence it is going to work before asking to "try again".
