EDITION: Standard and Enterprise
ERROR:
Email error message: 421 4.4.2 Message submission rate for this client has exceeded the configured limit when sending automatic emails
RESOLUTION
This email error message when processing automatic emails using credit class processing using an Exchange email/server is due to a setting on the default receive connector.
The Receive Connector MessageRateLimit needs to be changed. If you are using the default receive connector and do not want to change the message rate for that one, you can set up a second connector for SARA only and change the rate on the one for SARA only.