allow or suppress the auto replies when sending emails to groups.

Recently one of our users reported an issue that when he sent an email to a large distribution list, he did not receive any Auto Reply, OOF from any user. Though, there were many users had Auto Reply configured at that time.

There are few group properties which can cause this –

ReportToManagerEnabled –  The ReportToManagerEnabled parameter specifies whether delivery status notifications (also known as DSNs, non-delivery reports, NDRs, or bounce messages) are sent to the owners of the group (defined by the ManagedBy property). Valid values are

  • $true: Delivery status notifications are sent to the owners of the group.
  • $false: Delivery status notifications aren’t sent to the owners of the group. This is the default value.

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.

SendOofMessageToOriginatorEnabled –  The SendOofMessageToOriginatorEnabled parameter specifies how to handle out of office (OOF) messages for members of the group. Valid values are:

  • $true: When messages are sent to the group, OOF messages for any of the group members are sent to the message sender.
  • $false: When messages are sent to the group, OOF messages for any of the group members aren’t sent to the message sender. This is the default value.

Based on the above values, Exchange Online adds a header “X-Auto-Response-Suppress” to message to suppress or allow the Auto Replies or OOF.

Like in my example – SendOofMessageToOriginatorEnabled was False and I can see header “X-Auto-Response-Suppress” with value “DR, OOF, AutoReply” in the message properties.

We can adjust these values to allow or suppress the Auto Replies, OOF from groups.

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