Hi,

I've noticed that, recently, the messages I post are reflected by
groups.io with a sender named

  "Laszlo Ersek via Groups.Io"

This is nothing short of brain-damaged, and should be reverted
immediately.

Now, I'm 100% sure that I personally haven't changed anything in either
my email setup, or in my groups.io account. Therefore, it is either a
change in groups.io, or a change in the Red Hat email infrastructure.

Unfortunately, I can't tell where I should start looking / complaining.
Can someone give me hints please?

I've compared the email headers on the following two messages (both
attached, for convenience):

- Last correctly reflected message:
  http://mid.mail-archive.com/927a6e50-1106-92d1-3480-4d4492ca2340@redhat.com
  https://edk2.groups.io/g/devel/message/50310

- First incorrectly (with munged sender) reflected message:
  http://mid.mail-archive.com/0a690fc0-e551-b94e-e129-d5f02d76a62a@redhat.com
  https://edk2.groups.io/g/devel/message/50365

In the bogus message, I see a bunch of "mimecast.com" references, plus
headers like: "ARC-Message-Signature", "ARC-Seal",
"ARC-Authentication-Results".

Is this another botched anti-spam attempt?

Thanks
Laszlo