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EMS supports messages up to a maximum size of 512MB although EMS does not hard code this limit. It is recommended that applications use small message sizes since messages approaching the maximum size will strain the performance limits of most current hardware and operating system platforms.

Beginning with EMS 6.0, a new EMS server parameter was introduced which defines a hard limit on message size: max_client_msg_size

max_client_msg_size = size [KB|MB|GB]

Maximum size allowed for an incoming message.

This parameter setting instructs the server to reject incoming messages that are larger than the specified size limit. When omitted or zero, the EMS server accepts and attempts to process messages of any size.