I ran one of my domains (antioxid.com) through DNS Report - http://dnsreport.com/tools/dnsreport.ch?domain=antioxid.com - and it’s quite an impressive tool. Everything seems fine, except this:
WARNING: One or more of your mailservers is claiming to be a host other than what it really is (the SMTP greeting should be a 3-digit code, followed by a space or a dash, then the host name). This probably won’t cause any harm, but is a technical violation of RFC821 4.3 (and RFC2821 4.3.1). Note that the hostname given in the SMTP greeting should have an A record pointing back to the same server.
fltr-in1.mail.dreamhost.com claims to be host enforcer.dreamhost.com [but that host is at 220.127.116.11, not 18.104.22.168].
fltr-in2.mail.dreamhost.com claims to be host deathwish.dreamhost.com [but that host is at 22.214.171.124, not 126.96.36.199].
“enforcer” and “deathwish”? Hmmm… Are these real DH server names? Spooky