groups?
I beg your pardon, @Denis_Pollini. As groups seems you posted email aliases.
therefore: the “Group List” should I consider as “User group list” without any email-releated groups?
Hi any update?
Hi guys
Any ideas to continue troubleshooting?
It seems a problem on the Acronis side because mails from other senders to Nethserver are working. There are no entries in the Nethserver maillog about rejected mails so I assume they’re just not sent by Acronis. Did you already try to configure Acronis to send the report only to report@mydomain.tld and not to multiple recipients?
I don’t use Acronis but there seems to be a log to check and some other troubleshooting steps:
Hi open a ticket on Acronis Support, and the problem was the address “backup@mydomain.tld” was in our “supression list” and after remove from the list now i can receive the mail.
Thanks for the support
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So actually NethServer was considered guilty before proof 
Sincerely at the beginning i assumed that the problem was related to the spam filter or the mail server because before with the other mail server I have never had any problems.
But checking the mail log the mail not arrived so it wasn’t a mail server problem…
I don’t know why this address ended up in the acronis supression list.
During email tracking for understanding issues, sometimes you have to remember yourself that something is out of your control.