CentOS 6.3 | SendMail 8.14.4
I'd like to throttle inbound emails to a specific address via sendmail. Is that possible? Ideally I'm looking for the opposite of greylisting: Accept the first email from a remote sender but defer future emails from that sender for X number of hours.
To further elaborate... I have an email address that is associated with an application. The application takes an incoming message and responds to the sender with a customized auto-response based on the incoming email content it receives. I want to make sure that this workflow is protected against accidental (or intentional) mass emails by allowing the first message and blocking/deferring future messages for a certain amount of time.