Zimbra blacklisted

[ask2me007]

Pls help me to solve my problem.Iam a newbie in zimbra.The installation was successful after help from this forum.It ran well for one day.After that I found all external mails seems bounced.On thorough check it seems that my ip has been blocked.How can i settle this problem?Also how can i prevent my ip from blacklisting??? A speedy reply is solicited.
Thank you in advance...

[phoenix]

Originally Posted by ask2me007

Pls help me to solve my problem.Iam a newbie in zimbra.The installation was successful after help from this forum.It ran well for one day.After that I found all external mails seems bounced.On thorough check it seems that my ip has been blocked.How can i settle this problem?Also how can i prevent my ip from blacklisting??? A speedy reply is solicited.
Thank you in advance...

I'm afraid that's nota problem we can help you with. The usual reason for an IP to be blacklisted is that mail has been sent from it (it takes a lot of spam to get blacklisted) or from one of the machines on the network. You need to review the reasons for the blacklist, check the machines on your LAN don't have a malware installed and get the blacklist removed.

[ask2me007]

Originally Posted by phoenix

I'm afraid that's nota problem we can help you with. The usual reason for an IP to be blacklisted is that mail has been sent from it (it takes a lot of spam to get blacklisted) or from one of the machines on the network. You need to review the reasons for the blacklist, check the machines on your LAN don't have a malware installed and get the blacklist removed.

Is it a solution by installing a firewall???
Whether zimbra causes any problem working with shorewall firewall????

[phoenix]

Your server is behind a firewall or NAT router isn't it?

[ask2me007]

Originally Posted by phoenix

Your server is behind a firewall or NAT router isn't it?

My server is under NAT router.Actually the mail server is behind NAT and only port 25,7071 is forwarded to NAT.
As you said some machines in my NAT is sending spams.How can i stop these kind of activities???

[phoenix]

Originally Posted by ask2me007

My server is under NAT router.Actually the mail server is behind NAT and only port 25,7071 is forwarded to NAT.

Then you don't necessarily need a firewall in this situation.

Originally Posted by ask2me007

As you said some machines in my NAT is sending spams.How can i stop these kind of activities???

In that case you must take an inventory of what machines are on your LAN and which ones are sending spam and how they're doing it. If you have machines sending spam then you will continue to get blacklisted, this is an internal security problem.

[ask2me007]

Originally Posted by phoenix

Then you don't necessarily need a firewall in this situation.

In that case you must take an inventory of what machines are on your LAN and which ones are sending spam and how they're doing it. If you have machines sending spam then you will continue to get blacklisted, this is an internal security problem.

I know this is not at all zimbra related problems.But can you give any links related to this? Also on which port these spams are passing through?
Can i block the port 25 only open to my zimbra server??If you have any articles to solve such situation, it would be very much helpul.
Again Iam sorry to ask you a non Zimbra question.


Thank you