Requirement: message.foreign

A provider must be prepared to accept, from a client, a message whose implementation is not one of its own. A message with a 'foreign' implementation may not be handled as efficiently as a provider's own implementation; however, it must be handled.
Note that if the foreign message implementation contains a JMSReplyTo header field that is set to a foreign destination implementation, the provider is not required to handle or preserve the value of this field.

See:

• Section 3.12, Provider Implementations of JMS Message Interfaces