Mail flood handling in on error of application.cfc

I can think of a method similar to EddieLotter's.

1. In onApplicationStart, initialize: 

<cfset application.mailFloodChecker=0>

2. Obtain from your records an identifying string that is present in the stacktrace of every flooder mail. Use it in onError to check if e-mail is from the mail flooder. If so, send only the first such e-mail:

<!--- In my case, the stacktrace of every mail flooder contains the text "Variable NGAHNMBBVCDSEWJHTTP is undefined" --->
			<cfif structKeyExists(arguments.exception, "stacktrace") and findNoCase("Variable NGAHNMBBVCDSEWJHTTP is undefined", arguments.exception.stacktrace) gt 0>
				<cfif application.mailFloodChecker eq 0>
					<cfmail>
						... etc
					</cfmail>
					<cfset application.mailFloodChecker = 1>
				</cfif>
			</cfif>

Besides Eddie's helpful suggestion, note that this problem is indeed solved by error handling framework solutions/services that can be leveraged from cfml. They imbue all that intelligence from years of experience, saving you thinking of how best to prevent such floods, while handling that error and others intelligently.

I keep a list of them as a category of my cf411 site, specifically:

https://www.cf411.com/error

Let us know if you find one that seems to suit you. 

I use an application variable that is set to 0 when the application starts.

In the application error handler, I increment that variable each time an error is emailed to me. Once the variable reaches a threshold, I don't send any more emails.

Since my applications only get used during business hours, the variable is set each morning by the first person to use the app.