i have a customer that is having problems with his email, he has an exchange server and the problem is that most recipients outside his network are getting his email as SPAM, i been looking at the DNS records using DNSSTUFF.COM and the test is saying that the domain does not have a PTR record, the registar is godaddy, and on their control panel i can seem to find a way to add a ptr record, i have a A record as mail.domainname.com pointing to the ip address that the exchange server listens to, dnsstuff report, also shows the following warnings:
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.mydomain.com claims to be host mydomain.com [but that host is at XX.XXX.X.XXX (may be cached), not XX.XXX.XXX.XXX]. <br />
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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).
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can you guys please point me in the right direction to make sure that all my DNS records are fine and that email doesnt get marked as SPAM.
Thanks
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is that something that will required a dedicated service like a T1? the mail server is hosted on a comcast business line, will they add the PTR record?
also, i am using SBS 2003, and the exchange version that comes with it. i will research the link that you sent me and see if i can correct the way that exchange is announcing itself
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by: SembeePosted on 2007-11-03 at 15:15:46ID: 20208267
PTR records are not set by your domain name registrar, they are set by your ISP. Therefore you will have to call them up and ask them to set the PTR (aka reverse DNS) record to mail.domain.com .
You also need to change the Exchange server to announce itself correctly. However as you haven't said which version of Exchange you are using so further advice isn't possible.
I have a guide to DNS configuration for Exchange here: http://www.amset.info/exch
Simon.
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