I’ve been working on upgrading my mail gateway setup to something a little more decent, and as of tonight (in my new testsetup) I’ve implemented relay recipient maps in postfix. Should be way better the gateway mailqueue and also for the internet as a whole, since I won’t be generating any more blowback like I am doing now (when mailing to a nonexisting address, the gateway accepts the mail, tries to deliver, then creates a bounce message and tries to deliver that one, usually trying to email nonexisting users or innocent bystanders whose From: address was forged). Also implemented some SNMP polling for queue size, more to follow. Yay. 
PS: Thanks to DaViper for providing me with a virtual machine and a subnet to host my off-net DNS and Mailgateway on, much appreciated!
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