Locally owned and operated since 1993
Sunday May 11 2008
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Sunday May 11 2008 | |
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E-mail Rejection ExplanationYou are likely reading this page because an e-mail message you sent was rejected by one of our servers.Like thousands of other sites around the world, our mail servers will only accept mail from hosts that have a proper "reverse DNS" configuration. In more technical terms this means that the IP address assigned to your mail server does not have a "PTR record" assigned to it. This is not an e-mail specific issue. Every IP address that is in use on the Internet should also have a PTR record assigned to it. This has been a "best practice" since at least 1996, and there really is no legitimate reason for not having one these days. RFC 1912 is a document that discusses "Common DNS Operational and Configuration Errors". Section 2.1 states:
Every Internet-reachable host should have a name. The consequences of this are becoming more and more obvious. Many services available on the Internet will not talk to you if you aren't correctly registered in the DNS.Some sites may be tempted to shrug this off since they haven't encountered this until now, but they should be aware that this is not some over-zealous spam blocking measure, nor is it unique to our servers. Many sites have been enforcing this requirement for many years. The fact that it happens to stop a huge volume of spam is a bonus that makes it increasingly attractive to more and more sites. (One example of a large site that also enforces this policy is AOL) If you are one of our customers and you are having trouble receiving mail from an ill-configured site like this, contact us and we will temporarily exclude the sender's mail server from this check. If you are an end user of the misconfigured system then you should ask your ISP or IT department to fix the problem. If you are the administrator of a server that is missing a PTR record and you have control over your DNS, then you should fix it. If your DNS is handled by a third party, then you should ask them to add a PTR record for you. We find that most DNS providers are happy to oblige. You can read more about our e-mail practices and policies here.
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