In NPrinting, sending multiple reports by email fails with ERROR: 4.4.2 Message submission rate for this client has exceeded the configured limit.
This error usually happen when using Microsoft Exchange as a mail server
Environment:
Cause:
This is an error sent by Microsoft Exchange. It basically means that you have reached the limit of the MessageRateLimit
parameter in your Exchange receive connector.
Resolution:
There are currently no settings in NPrinting to decrease the message rate so we recommend to increase the MessageRateLimit in your Exchange Server.
http://www.servolutions.com/support/articles/messagesubmissionrate.htm