What usually happens when a message recipient can not be found? Will it be deleted or archived on the (destination) server? In 550 case, will the message body be sent at all?
Action: failed Status: 5.1.1 Diagnostic-Code: smtp;550 5.1.1 RESOLVER.ADR.RecipNotFound; not found
In my particular case the recipient runs ESMTP Sendmail 8.12.8/8.12.8