How Dead Letter Subscriptions Relate to Regular Subscriptions
The following describes the way in which dead letter subscriptions are affected by regular subscriptions for the same event type.
If the
Broker permits identical subscriptions to a regular event and a dead letter event. In this situation, the dead letter subscribers simply never receive any events.
If a wildcard definition in a dead letter subscription overlaps with that of a regular subscription, the
Broker distributes events that match the regular subscriptions to the appropriate clients and then routes the others to the dead letter subscriber.
An event type can have more than one dead letter subscriber.