Code:
Dec 19 21:16:40 cartoguild postfix/smtp[27888]: 70A62920016: host mxzhh.bluewin.ch[195.186.227.50] refused to talk to me: 554 Service unavailable from IP: 64.71.79.207. Please refer to http://csi.cloudmark.com/reset-request/?ip=64.71.79.207 if you feel this is in error
Dec 19 21:16:40 cartoguild postfix/smtp[27888]: 70A62920016: to=<emailremoved>, relay=mxzhb.bluewin.ch[195.186.99.50]:25, delay=420379, delays=420378/0.01/1.2/0, dsn=4.0.0, status=deferred (host mxzhb.bluewin.ch[195.186.99.50] refused to talk to me: 554 Service unavailable from IP: 64.71.79.207. Please refer to http://csi.cloudmark.com/reset-request/?ip=64.71.79.207 if you feel this is in error)
There's an example...So frustrating.
I'll check out OpenDMARC