Object Event Handler

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Hi we have an Object Event Handler that creates andincident based on the receipt of an email from a particular sender with a specifically formatted Subject line.  The OEH essentially creates the user, creates and incident, sends a transactional mailing and if successful deletes the incident.  During our testing, we have found that the process is being stopped under load. If we send one email it works fine and we have tested up to 50 emails successfully, however past that point the process appears to just stop.

 

Does anyone know if there is any "throttling" applied to processing OEH?  We have a requirement where we may receive up to 2000 emails in a short period time and would like to create the contact and send a mailing.