For most of the e-mail I can see automatic message like this:
A message could not be delivered to its recipients : <*adres1*>@gmail.com <*adres2*>@gmail.com Group : *@<domain.in.zoho>========================= Forwarded message =========================Subject: ***From: "System Synergia"<add@some.domain.some.where>Date: Mon, 21 Mar 2022 15:49:22 +0100To: *@<domain.in.zoho>------------------------- Contents ------------------------- ... and here is coming original messsage.
I've replaced all meaning e-mail addresses.
There is no even any explanation why ot was not delivered,
Where should I look for any details?