Using several different "DNS health tests" today, I've had two report that the SMTPD greeting is wrong/mis-configured.
For example, the test at http://www.dnsqueries.com says I fail this specific test, and then follows that up with:
Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server.
I'm running Bind as the nameserver for ns1.smoothstoneservices.com and ns2.smoothstoneservices.com, and the mail server is running Postfix.
OS is CentOS.
Looking at the smtpd_banner directive in /etc/postfix/main.cf, it is set to: mail.smoothstoneservices.com
DNS includes A records for both "mail.smoothstoneservices.com" (smtpd greeting), as well as myers.smoothstoneservices.com (hostname).
Here's the contents of my zone file:
$TTL 1H
@ IN SOA ns1.smoothstoneservices.com. admin.smoothstoneservices.com. (
2012021115; serial
1800 ; refresh
400 ; retry
1209600; expire
3600 ; Minimum
)
IN NS ns1.smoothstoneservices.com.
IN NS ns2.smoothstoneservices.com.
@ IN MX 0 mail.smoothstoneservices.com.
@ IN A 69.164.221.183
@ IN TXT "v=spf1 a mx ip4:69.164.221.183 -all"
localhost IN A 127.0.0.1
myers IN A 69.164.221.183
ns1 IN A 69.164.221.183
ns2 IN A 66.228.59.103
mail IN A 69.164.221.183
{Some info snipped that you don't need to know}
A test on http://mxtoolbox.com for MX and mailserver health indicate everything is OK.
But since I've seen similar "errors" with two separate "dns health" tests / websites, I'm suspicious that I might be missing something.
I'm confused. Do you see any problems? What's your opinion?