Internet Email Auto-Protect: Mail Server setting is gone

In SEP 12.1.5 I just discovered that in the Internet Email Auto-Protect settings in the AV/AS policy, it's not possible anymore to insert a mail server. That's necessary if you want the client to send a notification to the sender of the suspicious mail or to another person. The tab under AV/AS policy > Internet Email Auto-Protect > Notifications > Send Email to sender/others is just gone.

For this reason the clients are not able to send warning messages if they are getting suspicios mails. Strange thing is that in the client GUI the mail server setting still exists. The Installation & Administration guide mentions the vanished setting as well.

Is this a bug or do I miss something?