I have a client currently receiving an error message from one of their clients Exchange Server when they are sending them an e-mail.
xxxxxxx.COM #5.5.0 smtp;554 EMail from mailserver at xx.xx.xxx.xxx is refused. See
http://spamblock.outblaze.com/xx.xx.xxx.xxxI went to DNSREPORT.COM and this is these are the warnings I received:
WARN Single Point of Failure WARNING: Although you have at least 2 NS records, they may both point to the same server (one of our two tests shows them being the same, the other does not), which would result in a single point of failure. You are required to have at least 2 nameservers per RFC 1035 section 2.2.
WARN SOA EXPIRE value WARNING: Your SOA EXPIRE time is : 3600000 seconds. This seems a bit high. You should consider decreasing this value to about 1209600 to 2419200 seconds (2 to 4 weeks). RFC1912 suggests 2-4 weeks. This is how long a secondary/slave nameserver will wait before considering its DNS data stale if it can't reach the primary nameserver.
WARN Mail server host name in greeting 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). If your mailserver sends out E-mail using this domain in its EHLO or HELO, your E-mail might get blocked by anti-spam software. This is also 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. Note that this one test may use a cached DNS record.
mail.xxxxxx.net claims to be host xxxxxx.NET [but that host is at xx.xx.xxx.xxx (may be cached), not xx.xx.xxx.xxx].
WARN SPF record Your domain does not have an SPF record. This means that spammers can easily send out E-mail that looks like it came from your domain, which can make your domain look bad (if the recipient thinks you really sent it), and can cost you money (when people complain to you, rather than the spammer). You may want to add an SPF record ASAP, as 01 Oct 2004 was the target date for domains to have SPF records in place (Hotmail, for example, started checking SPF records on 01 Oct 2004).
As always, thank you in advance for any assistance!
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