Ignore Email Request

Experts,

Is there a way for RT to ignore email request based on subject.

ie Request subject: failure notice
Request subject: RECOVERY

I do not want ticket to be created. nor merge tickets if there’s an existing
one.

I believe scrips will not help but if there’a config file on RT that can do
this. Some mentioned using the MTA or mail-gateway but I do not have any
idea on how to implement it.

Thanks in advanced!