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If you’re sending to an internal distribution group - You might not have permission to send to the group or to one of its subgroups.

In this case, the NDR includes the names of the restricted groups that you don’t have permission to send to.

MX Records are the resource entries in your domain’s DNS, which transmit email server information to other DNS Servers on the web, which then send emails to your domain.

You can change the MX Records after creating all of the user accounts and email addresses in Zoho.

Multiple MX records do not deliver emails to multiple servers.