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pedza
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Hello!

Few days ago some mail servers started to block our messages - senders in my organization  are receiving NDRs referencing to spamcop, including link: 
https://www.spamcop.net/bl.shtml?OUR_MAIL_SERVER_IP_ADDRESS

I have visited spamcop site and check our mail server IP address - the result is: OUR_MAIL_SERVER_IP_ADDRESS not listed in bl.spamcop.net
 

Now i am confused - messages are rejected and ip address is not on BL.

How to proceed?

Thank you in advance for any idea!

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2 hours ago, pedza said:

Hello!

Few days ago some mail servers started to block our messages - senders in my organization  are receiving NDRs referencing to spamcop, including link: 
https://www.spamcop.net/bl.shtml?OUR_MAIL_SERVER_IP_ADDRESS

I have visited spamcop site and check our mail server IP address - the result is: OUR_MAIL_SERVER_IP_ADDRESS not listed in bl.spamcop.net
 

Now i am confused - messages are rejected and ip address is not on BL.

How to proceed?

Thank you in advance for any idea!

Some mailservers run their own blocklist and blame bl.spamcop.net 
go here to see what your email servers reputation is
https://talosintelligence.com/reputation_center

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On 9/26/2020 at 1:48 PM, pedza said:

I have visited spamcop site and check our mail server IP address - the result is: OUR_MAIL_SERVER_IP_ADDRESS not listed in bl.spamcop.net

Also good to know is that some people would make their own blacklist or point it to spamhaus, but leave the "data response" section indicating it was done by SpamCop.  The following is one configuration that was found a few years back and you can see that there can be more than one blacklist on the message.

reject_domains:
deny    message       = rejected because $sender_host_address is in a black list at bl.spamcop.net
dnslists      = bl.spamcop.net : sbl.spamhaus.org : xbl.spamhaus.org

I do not like how someone people left their configurations blaming SpamCop if (such as this example) the IP is on a blacklist at SpamCop or spamhaus.  If your mail server IP is not listed in bl.spamcop.net, either it was for a small time or the email provider has their own blacklist and is blaming SpamCop.  Those, I have to use my hotmail email to ask them why since they could be blocking my other address.

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