No, but it's related. Your sever's IP address must have an rDNS entry
(maintained by your ISP) in order for most servers to receive mail from
you. The rDNS entry should also be resolvable.
What we're saying here, however, is that the rDNS name does not need to
match the name provided in the EHLO greeting (smtpgreeting file).
BL, the 554 error you have indicates that there is no rDNS for your
server's IP address, or perhaps if there is an rDNS that it's not
resolvable.
The 'host' command is handy for checking this.
$ host qmailtoaster.com
qmailtoaster.com has address 66.226.75.14
qmailtoaster.com mail is handled by 10 mail.qmailtoaster.com.
$ host mail.qmailtoaster.com
mail.qmailtoaster.com has address 70.60.227.157
$ host 70.60.227.157
157.227.60.70.in-addr.arpa domain name pointer mail.qmailtoaster.com.
$
In this case, you see that the pointer (last line) is
mail.qmailtoaster.com. This is good and clear, but not necessary. It
could resolve to somehost.somedomain.com and things would still work,
just so long as somehost.somedomain.com resolved to an IP address. It
wouldn't necessarily need to resolve to your server's address, but it's
nice when it does.
--
-Eric 'shubes'
On 10/20/2010 04:18 PM, Tony White wrote:
Hi folks,
Is this the same issue you are discussing please?
Remote host said: 554 This server requires PTR for unauthenticated
connections.
On 21/10/2010 7:11 AM, Eric Shubert wrote:
Amit is correct. It might effect spam scoring (I don't know that it
does), but it should not prevent acceptance by the destination server.
Here's what RFC 2821 says about this:
" An SMTP server MAY verify that the domain name parameter in the EHLO
command actually corresponds to the IP address of the client.
However, the server MUST NOT refuse to accept a message for this
reason if the verification fails: the information about verification
failure is for logging and tracing only."
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