Default exim.conf makes server blacklisted on backscatterer.org

[Remco00]

One of our servers is being blacklisted at backscatterer.org. Sending out NDR and accepting mailadress verify, seems to put your server on their listings. The exim.conf of the blacklisted server is default. So my question is: what should be changed in the exim.conf to prevent servers from being listed by backscatterer.org.

More info on: http://www.backscatterer.org

 

[walleed222]

I think ata least you must install spam assassin

 

[Remco00]

Thanks for replying. Our servers are running with the latest SA and Exim. The standard DA exim.conf is being used.

 

[mattb]

So my question is: what should be changed in the exim.conf to prevent servers from being listed by backscatterer.org.

Easy hash out this line.

require verify = sender

It should read:

#require verify = sender

Then restart exim.

The verify senders are lame and puts additional load on other servers.
A good explanation is found on : http://www.backscatterer.org/?target=sendercallouts

Cheers,

Matt.

 

[GXX]

Thanks for replying. Our servers are running with the latest SA and Exim. The standard DA exim.conf is being used.

The standard DA exim.conf has

#require verify = sender

already commented out. Are you sure nothing was changed in your conf?

How old is your system? Possibly this was not commented out in really early versions of the conf?

 

[Remco00]

Thank you for responding. Indeed the require verify = sender is already commented out as we use standard SpamBlocker.exim.conf.2.1.1-release. It must have something to do with the other reason why hosts are blacklisted.

More info is on: http://www.backscatterer.org/?target=backscatter

Anyone has an answer for preventing this?

 

[nobaloney]

I'm going to start studying this issue but I don't have any answers yet.

Jeff

 

[mattb]

Think it has to do with sending back NDR messages.

 

[nobaloney]

It does. Do you have any ideas with how to identify them and just freeze them?

Jeff