The AddressBlockRetrieve function is used to retrieve information about destinations which are blocked on an EasyLink system. The EasyLink "XDDS" system (used for fax, voice and simple email) and "MR" system (used for enhanced email and SMS) maintain separate sets of blocked destinations.

Especially for email addresses, there may be a large numbers of block records, and the processing time may be long and the response extremely large. It is strongly recommended that requests limit the amount of data requested by using the DateRange selection (in conjunction, if appropriate, with the AddressTypeGroup or AddressFilter elements).