Is it possible to whitelist smrt mail relay by email address?  We're in the process of migrating to Smartermail from another platform.  On the old platform, I was able to whitelist email relay by IP and email address.  This was done so we (and a couple of our customers) could send out using a fake specfic few email addresses (such as noreply@somedomain.com).  I've currently got email relay set to Nobody so authentication is required for everyone except the whitelist.  I've whitelisted a couple of our internal server IPs.  But, there's also a couple of email addresses that don't actually exist on our server that could come from various IPs  that I had whitelisted on our previous platform.  I cannot seem to find a way to do that in Smartermail.  Is it possible to do so?