Send e-mail to a black listed IP

Posted on 2014-02-12
Last Modified: 2014-02-24
I know that when an IP is in a blacklist then it is possible an email to rejected by receiver's mail server. Namely you haven't the ability to send e-mails to some mail servers that use these blacklists. Is it possible the reverse? Namely  some mail servers decide not to send e-mail to an IP that is black listed? So you can not send e-mail but also you can not receive e-mail...
Question by:nonlinearly
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LVL 37

Expert Comment

by:Jamie McKillop
ID: 39856008

I'm not aware of any mail server products that would leverage a blacklist when sending. You could manually configure your server to not send to specific domain, but you would have to manually compile and maintain that list yourself.


Author Comment

ID: 39856573
No, the problem is not to not send e-mail to a blacklisted IP through my exchange server... The problem is:
we have a router with a connection IP and we have a secondary IP from a pool of 8 IPs that our provider gave us for our mail server. When we use the router with the primary connection IP some mail servers can not send e-mail to us... But when we make an IP mapping to the router namely the mail's server internal IP (192.168...) to the secondary public IP (not the connection IP but one from the 8 pool IPs) then the IP that the router use change to this IP and then we haven't any problem receive e-mail from anyone...
I searched if the first IP was blacklisted and was true... so I thought if... but I think you have right about "I'm not aware of any mail server products that would leverage a blacklist when sending"
LVL 37

Expert Comment

by:Jamie McKillop
ID: 39856654
If your IP is blacklisted, it is for a reason. You need to take measures to ensure you are not a source of SPAM or malware. Once you solve that issue, you will eventually be de-listed.

Being on the blacklist would not prevent you from receiving email. There are many reasons why that could occur. The first step in troubleshooting would be to see if the sender is getting a non-delivery report and get a copy of that report. Since you are blacklisted, you could be an open relay and you could be getting hit with spammers relaying, would could be causing an overload on your server.


Author Comment

ID: 39858569
No... we have closed the open relay...besides if we would have the open relay opened then it would open for both IPs. So we would have problem anyway...
Also as I know most e-mail servers do not accept e-mails from mail servers that have open relay open... So we could not send e-mail to anyone... something that is false...we send e-mail but we can not receive e-mail from particular senders when we change the IP.
Thanks anyway...
LVL 37

Accepted Solution

Jamie McKillop earned 500 total points
ID: 39858900
You are going to need the non-delivery report from the sender that is having trouble to try and figure out what is going on.


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