Web Hosting Talk : Web Hosting Main Forums : Hosting Security and Technology : Client host rejected!

[madpato]

Hi ppl

I have a customer who is trying to send email to an email direction but it bounces back with an error like this:

SMTP error from remote mail server after RCPT TO:<bancaweb@credicoop.com.ar>:
host sas.credicoop.com.ar [200.47.24.10]: 450 4.7.1 Client host rejected:
cannot find your hostname, [64.76.xxx.xxx]: retry timeout exceeded

I know it has something about a reversal dns but how do i fix it?

Thank you in advance.

[JumpTech]

Get the DC your servers are in to setup RDNS on your IP address the email server uses.

[madpato]

sorry, what means DC? I'm pretty new in this stuff... could you care to explain a bit more.

By the way i use WHM/Cpanel on Centos

[JumpTech]

Your datacentre, many years back when the planet were rackshack they had a part on their control panel where you could administer reverse dns entries your self. take a look at

http://en.wikipedia.org/wiki/Reverse_DNS_lookup

It will explain to you what it means.

[N|Kitmitto]

Data Center

[madpato]

ok i have checked and i actually have a reverse dns entry for my server... so why i get the error anyway?

is there any other reason for that error?

[tajidyakub]

You might also try to put A Entry for your hostname in your domain master name server, not sure that this is the solution though

[paulsvail]

Smells more like greylisting if there is a 450 4.7.1 code.