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You need to register the external services to trust incoming LDN messages:
Administrators can do that using the menu LDN Services. Creating a new Notify Service means to submit the following form (note:
all fields, except 'Description' are required):
Every LDN message is going to have a link referring to the stored notify service. At time of writing it is the LDN Inbox URL. If the incoming LDN message has the LDN inbox url equals to one of the stored Notify Service' ldn_url - the LDN message is stored and queued as a trusted message, otherwise it’s flagged as untrusted.
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