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How to Whitelist/Blacklist /IP addresses on Postfix

We have a Linux Server and on that we are running Centos 4.4, i have created Exchange distribution groups but they are not working, because i believe they need to be whitelisted under postfix so that they reach to Exchange Server, now i am stuck at that.
Can anyone please guide me step by step on how to do that, because i am not that much familiar with Linux.

Thanks.

Kamran Arshad

Hi,

Please read the below articles:

www.howtoforge.com/how-to-whitelist-hosts-ip-addresses-in-postfix
http://www.linux.com/articles/40750

usmansultan

ASKER

I have already came across that tutorial, but i believe we already have a file in which host names are listed which are allowed, so in that tutorial where should i start, and how to get there and access it.......

Kamran Arshad

Hi,

So it is not whitelisting even after following the howtoforge tutorial. What are the values in the SMTP logs?

usmansultan

ASKER

I have to do the whitelisting under postfix, as i said earlier i am not sure how to access the whitelisting file and how to reach there.....

The SMTP error is;

Reporting-MTA: dns;bay0-omc1-s23.bay0.hotmail.com
Received-From-MTA: dns;BAY131-W27
Arrival-Date: Wed, 11 Jun 2008 19:11:56 -0700

Final-Recipient: rfc822;rtafacet@facet.com.au
Action: failed
Status: 5.5.0
Diagnostic-Code: smtp;554 <rtafacet@facet.com.au>: Recipient address rejected: Access denied

EmpireIron

do a search for local.cf
I believe that is the file you're looking for.

ASKER CERTIFIED SOLUTION

usmansultan

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