Could not connect: Got an unknown RCPT TO response: 550-Verification f

Incoming and outgoing emails from my server doesnt work

[aff_dan]

The server is not able to resolve yahoo.com or google.com or ping the domains. But the Ips of the domains are getting ping from the server without any issues. We have checked the nameserver entries in the resolv.conf file and other related files. The named service is running fine in the server. The issue seems to be a bit confusing.

Where could be the problem?

Regards,
Dan

[stajer]

A 550 response can mean you have been blacklisted. Check some RBL lists for your IP.

[aff_dan]

Hi Stajer,

it is not blacklisted:

[robtex.com...]
[spamhaus.org...]

[edited by: jdMorgan at 2:30 am (utc) on Mar. 17, 2006]
[edit reason] Obscured specifics. [/edit]

[aff_dan]

I can not ping yahoo.com

It doesnt work ping

[lammert]

Looking at your description, it seems to be a DNS lookup problem. Start the program nslookup and give the following commands:

set debug
yahoo.com
set d2
yahoo.com

The set debug and set d2 commands set the debug and verbose debug mode. You'll receive a detailed list of the query yahoo.com in both cases. This should tell you where the DNS query fails.