Ken, My understanding is that Groups.io does the standard connection-time checks to see that the connecting machine has valid DNS records identifying it as a mail server (aka, a "reverse DNS" lookup).

#issue #pirate

== Original Message == Hi, I start a test group on 9 march 2019 (with another mail), and some time later (26 march) i receive e-mail seemingly from this email account with only a jpg image including a

#spam #pirate #ransom