Avoiding spam on "Send to a Friend" features.

Store the number of send attempts by the sender in a new table and limit the number of sends based on a max count limit within a specified period of time, say within the last 24 hours.

New table, tableSends:

column1: senderAccountId

colun2: recipientAccountId

column3: timestamp

<cfset max_send_count = 2>

<cfquery name="qry1">

     SELECT COUNT(*) result

     FROM tableSends

     WHERE senderAccountId = '123' AND recipientAccountId = '999'

     AND DATEDIFF('h', timestamp, GETEDATE()) < 24

</cfquery>

<cfoutput>

     <cfif qry1.result LTE max_send_count>

          <!---Send another--->

          <!---Record send to the database table tableSends--->

     <cfelse>

         <!---You've reached the maximum allowed invites--->

     </cfif>

</cfoutput>

For a pure CF solution with no database, instead of storing variables in the new table below, store them into the CLIENT scope and set that scope's storage to REGISTRY in the server admin and set the purge interval to 24 hours.

<cfset CLIENT.sendRecords = "#senderAccountId#",'#recipientAccountId#','#timestamp#'>

...and use...

<cfif IsDefined("CLIENT.sendRecords") AND ListFind(senderAccountId, CLIENT.sendRecords)>

</cfif>

Good Luck!