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XtreemPMTA Auto Configure everything from IPs, vhosts, protect and hide the server, to making sure domain masking, DKIM, DMARC, SPF, rDNS and everything else works to ensure best possible delivery rates. The end result will be a fully configured bulk email server that is capable of sending millions of email per month and will give you a perfect 10/10 score on mail-tester.com and other similar newsletter spam test tools.