VPS Level 1, Sendmail questions

[Jean-Luc]

Hi,

Here is what I get when I try to send an email from a PHP script:

The original message was received at Tue, 17 Aug 2010 09:56:07 -0500
from localhost.localdomain [127.0.0.1]
   ----- The following addresses had permanent fatal errors -----
<valid-address@my-other-domain.com>
    (reason: 550-Verification failed for <existing-user@my-vps.com>)
   ----- Transcript of session follows -----
... while talking to my-other-domain.com.:
>>> DATA
<<< 550-Verification failed for <existing-user@my-vps.com>
<<< 550-No Such User Here
<<< 550 Sender verify failed
550 5.1.1 <valid-address@my-other-domain.com>... User unknown
<<< 503-All RCPT commands were rejected with this error:
<<< 503-Sender verify failed
<<< 503 Valid RCPT command must precede DATA

I am able to send emails to some domains, but not to others. This is an example of the message that is sent back to postmaster@int.my-vps.com when an email fails.

my-vps.com stands for the domain name of my VPS. int.my-vps.com is the machine name and my-other-domain.com is another domain of mine hosted on a HostGator shared server.

How I should deal here with my-vps.com and int.my-vps.com is not clear to me. I have even no idea why the int subdomain was created by HostGator in the VPS.

What am I doing wrong ? Thank you in advance.

Jean-Luc

[quietFinn]

Originally Posted by Jean-Luc

my-vps.com stands for the domain name of my VPS. int.my-vps.com is the machine name and my-other-domain.com is another domain of mine hosted on a HostGator shared server.

How I should deal here with my-vps.com and int.my-vps.com is not clear to me. I have even no idea why the int subdomain was created by HostGator in the VPS.

Sending is failing because the receiving server is not able to verify the sending address.

Are the nameservers of my-vps.com correct, and is there a DNS zone for that domain in your VPS?

int.my-vps.com is the hostname of your (vps) server, not really a subdomain, and it must resolve to the main shared IP of your (vps) server.

[Jean-Luc]

Thank you for your answer quietFinn.

My zone setup contains:

@ 10800 IN TXT v=spf1 a mx -all
www 10800 IN CNAME my-vps.com.
@ 10800 IN MX 10 my-vps.com.
@ 10800 IN A <my IP address here>
@ 10800 IN MX 50 my-vps.com.
int 10800 IN CNAME my-vps.com.

and a few other things.

Does this look valid ?

I read also about reverse DNS. Must it be set to my domain name to enable the verification of the sending address ?

Jean-Luc

[quietFinn]

Sorry but I am not able to help you more without knowing the actual domain in question.

Originally Posted by Jean-Luc

I read also about reverse DNS. Must it be set to my domain name to enable the verification of the sending address ?

Your server's main shared IP's reverse dns should return your server's hostname int.my-vps.com. I don't think that has anything to do with your mail problems, I believe it's something with the domain's DNS.

[Jean-Luc]

The problem has been solved with the help of HostGator tech support.

In fact, before I bought the VPS, I already owned my-vps.com and I parked this domain in the same shared hosting plan as my-other-domain.com. When I bought the VPS, I forgot to remove the parked domain in the shared hosting plan. So when I was emailing from my-vps.com to my-other-domain.com, my-other-domain.com was not able to verify my-vps.com. Sounds a bit confusing, isn't it ?

Anyway, the parked domain has been removed now and all the mails go where they have to.

Thank you again.

Jean-Luc