DocFraggle
This is a log from postfix showing DQS is working:
postfix-mailcow-1 | Feb 27 10:32:03 4bc642328ab9 postfix/postscreen[5658]: CONNECT from [89.44.209.15]:48362 to [172.22.1.253]:25
postfix-mailcow-1 | Feb 27 10:32:03 4bc642328ab9 whitelist_forwardinghosts: Look up 89.44.209.15 on whitelist, result 200 DUNNO
postfix-mailcow-1 | Feb 27 10:32:03 4bc642328ab9 postfix/dnsblog[5675]: addr 89.44.209.15 listed by domain b4nf4wop2vfuv3iqynh3yc5wxe.zen.dq.spamhaus.net as 127.0.0.3
postfix-mailcow-1 | Feb 27 10:32:03 4bc642328ab9 postfix/dnsblog[5674]: addr 89.44.209.15 listed by domain bl.mailspike.net as 127.0.0.10
postfix-mailcow-1 | Feb 27 10:32:04 4bc642328ab9 postfix/dnsblog[5673]: addr 89.44.209.15 listed by domain hostkarma.junkemailfilter.com as 127.0.0.2
postfix-mailcow-1 | Feb 27 10:32:04 4bc642328ab9 postfix/dnsblog[5673]: addr 89.44.209.15 listed by domain hostkarma.junkemailfilter.com as 127.0.1.1
postfix-mailcow-1 | Feb 27 10:32:06 4bc642328ab9 postfix/postscreen[5658]: DNSBL rank 11 for [89.44.209.15]:48362
postfix-mailcow-1 | Feb 27 10:32:07 4bc642328ab9 postfix/tlsproxy[5679]: CONNECT from [89.44.209.15]:48362
postfix-mailcow-1 | Feb 27 10:32:13 4bc642328ab9 postfix/tlsproxy[5679]: warning: TLS library problem: error:0A000102:SSL routines::unsupported protocol:../ssl/statem/statem_srvr.c:1657:
postfix-mailcow-1 | Feb 27 10:32:13 4bc642328ab9 postfix/tlsproxy[5679]: TLS handshake failed for service=smtpd peer=[89.44.209.15]:48362
postfix-mailcow-1 | Feb 27 10:32:13 4bc642328ab9 postfix/postscreen[5658]: HANGUP after 6.3 from [89.44.209.15]:48362 in tests after SMTP handshake
postfix-mailcow-1 | Feb 27 10:32:13 4bc642328ab9 postfix/postscreen[5658]: DISCONNECT [89.44.209.15]:48362
postfix-mailcow-1 | Feb 27 10:32:13 4bc642328ab9 postfix/tlsproxy[5679]: DISCONNECT [89.44.209.15]:48362