Currently, for the pipeline step (emailext) it seems that developers add added by default to recipient list.

https://github.com/jenkinsci/email-ext-plugin/blob/master/src/main/java/hudson/plugins/emailext/EmailExtStep.java#L153

https://github.com/jenkinsci/email-ext-plugin/blob/master/src/main/java/hudson/plugins/emailext/plugins/trigger/AlwaysTrigger.java#L41

Dont see any options available to remove this if needed (without resorting to hacking with groovy init script)

Proposing making this a configurable option.