Issue Description: There is a known issue with Dynamic Distribution Lists that target a very large volume of recipients whereby a DDL cannot be created or edited due to a timeout error.
Latest Update – 01/02/2018: A fix was implemented during December 2017 that enabled large DDLs to be created and edited normally and users should proceed to use the Portal user interface to action. However it has been identified that there remains an issue with the creation/editing extremely large DDLs that target more than approximately 21,000 recipients. Whilst a fix for this is being developed, if a new DDL that fails creation or you are unable to edit an existing DDL, please raise a request with the NHSmail Helpdesk quoting the DDL email address and the rule you wish to apply. The DDL will be created/amended as requested by an engineer.
