I've moved some more domains over to my new server that I've been building with your assistance. :D
While I get the configuration finalized, I'd like to send temporary failures, rather than permanent failures, so that I can alter my configuration and have the sending server retry. I only have filters that result in 550s - mostly for spam-control measures. Is it possible to reduce the severity of an invalid user, so that I get the chance to correct any remaining configuration problems, rather than just rejecting the mail entirely? Thanks again!