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

Incoming and outgoing emails from my server doesnt work



6:06 pm on Mar 16, 2006 (gmt 0)

10+ Year Member

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?



6:45 pm on Mar 16, 2006 (gmt 0)

10+ Year Member

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


6:49 pm on Mar 16, 2006 (gmt 0)

10+ Year Member

Hi Stajer,

it is not blacklisted:


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


6:53 pm on Mar 16, 2006 (gmt 0)

10+ Year Member

I can not ping yahoo.com

It doesnt work ping


3:20 pm on Mar 17, 2006 (gmt 0)

WebmasterWorld Senior Member lammert is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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

set debug
set d2

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.


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