DMARC, Gmail and Groups

DMARC, Gmail and Groups

Hi.

I have a group that includes some Gmail addresses and other private ones.

One of the private addresses sent an email to the group and for all the Gmail addreses I received an email:

Mail Forward Failure

The following message could not be forwarded to user@gmail.com for user@domain-on-zoho-with-group.com

Technical details of the failure:
5.7.1 Unauthenticated email from sending-domain.com is not accepted due to
5.7.1 domain's DMARC policy. Please contact the administrator of
5.7.1 sending-domain.com domain if this was a legitimate mail. Please visit
5.7.1 https://support.google.com/mail/answer/2451690 to learn about the
5.7.1 DMARC initiative. 2si3297364ots.275 - gsmtp



Should I make some tweaks on the domain hosted on Zoho? Or is it a Gmail or sending-domain's issue? Thanks.