On Thu, 6 Dec 2018, Noel Jones wrote:
Wild guess: some spammer used your own address as sender, and the connection was rejected by some of your spam controls, probably an rbl.
Noel, There are certainly many rejected by a couple of rbls as well as by other postfix UCE checks. Why these two were listed separately by pflogsumm is not obvious when I look at the list grep returned. Thanks, Rich
