Hi @MrBunne ,
Can this issue be related to the group configuration?
Get-distributiongroup | fl name, *ReportTo*
-ReportToOriginatorEnabled
The ReportToOriginatorEnabled parameter specifies whether delivery status notifications (also known as DSNs, non-delivery reports, NDRs, or bounce messages) are sent to senders who send messages to this group. Valid values are:
$true: Delivery status notifications are sent to the message senders. This is the default value.
$false: Delivery status notifications aren't sent to the message senders.
The ReportToManagerEnabled and ReportToOriginatorEnabled parameters affect the return path for messages sent to the group. Some email servers reject messages that don't have a return path. Therefore, you should set one parameter to $false and one to $true, but not both to $false or both to $true.
You could use Set-DistributionGroup to modify this parameter
Set-DistributionGroup "group" -ReportToOriginatorEnabled $true -ReportToManagerEnabled $false
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