I received such message as well. You can ignore it.
> On Feb 20, 2017, at 5:46 AM, Cheyenne Forbes > <cheyenne.osanu.for...@gmail.com> wrote: > > Hi! This is the ezmlm program. I'm managing the > user@phoenix.apache.org mailing list. > > > Messages to you from the user mailing list seem to > have been bouncing. I've attached a copy of the first bounce > message I received. > > If this message bounces too, I will send you a probe. If the probe bounces, > I will remove your address from the user mailing list, > without further notice. > > > I've kept a list of which messages from the user mailing list have > bounced from your address.
