Email Bounce Back

Hi IPS,

I know you explained inability of efficient implementation of such for self-hosted solutions, however, would you be able to add ability to manually mark accounts to do not send emails to? It would help bounce back in case of using bulk-email send. For now I manually review our inbox and do the same with some workaround to prevent massive bound-backs when sending bulk emails. Having ability to mark accounts with some DB stored flag would help a lot, as I could automate the process without use of custom plugins etc. I think many others could find the ability useful too. Thanks