Re: Does this mean reverse DNS was not setup?


"denoxis" <google@xxxxxxxxxxxx> wrote in message
news:1169829994.442513.6450@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hello,

I have a dedicated server for hosting purposes. It runs on Windows 2003
(but I don't think my question is Windows 2003-specific). Web apps from
this server sends notification emails to visitors. Some of the emails
bounce back because of (I guess) reverse DNS issue:

smtp;450 Client host rejected: cannot find your hostname,
[my.servers.ip.number]

Probably due to your not having the reverse PTR record OR
to your SMTP server not using that same name as the HELO
name of the SMTP server (software.)

Reporting-MTA: dns;MYSERVERNAME.MYISP.COM
As far I as understand it complains that my.servers.ip.number does not
resolve back to MYSERVERNAME.MYISP.COM even though other way around
works.

It must resolve to the name used in your SMTP server software
(for most people to trust you.)

That name doesn't have to be in any way related to your actual server
name (what you call it) nor to your email domain name.

I tried the IP and it actually resolves to an ARPA address (which I
cannot specify as a FQDN in SMTP settings in IIS6 because it says it is
invalid.)

What is it? What is your IP address? (We can check this for you...)

So, ARPA address resolves to my.servers.ip.number,
MYSERVERNAME.MYISP.COM resolves to my.servers.ip.number, but
my.servers.ip.number resolves back to ARPA address, NOT
MYSERVERNAME.MYISP.COM.

Does this mean reverse DNS was not setup?

Not if this command returns a name:

nslookup IP.Your.SMTP.Server

--
Herb Martin, MCSE, MVP
http://www.LearnQuick.Com
(phone on web site)


.

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