Spamcop blacklist
Hello,
We have a problem with an SMTP send farm. All public IP of the farm are blacklisted by Spamcop and we can't request a new delisting.
We are using an antispam filter for INcoming & OUTgoing mails. No mail can be send is a domain doesn't exist on our system. I download the list of sender contacted today & I tried to identify a problem on the list. But I found nothing suspect...
I think there is one (or many) mail adresses used by spamcop as "trap" to identify spam sender.
Have some advice to help me to solve this problem ?
Thanks.
We have a problem with an SMTP send farm. All public IP of the farm are blacklisted by Spamcop and we can't request a new delisting.
We are using an antispam filter for INcoming & OUTgoing mails. No mail can be send is a domain doesn't exist on our system. I download the list of sender contacted today & I tried to identify a problem on the list. But I found nothing suspect...
I think there is one (or many) mail adresses used by spamcop as "trap" to identify spam sender.
Have some advice to help me to solve this problem ?
Thanks.
ASKER
We are using Exchange 2013 CU18 (not the last CU. The las is 19).
I read the 2 links but I don't think we are in this situation. Exchange send mail through a first antispam appliance and after through an other antispam system. All is ok for mail transport, the problem is only the blacklist.
We are running a Exchange Audit with Microsoft Support and they don't identify any transport problem on our Exchange plateform except we are not on last CU.
I read the 2 links but I don't think we are in this situation. Exchange send mail through a first antispam appliance and after through an other antispam system. All is ok for mail transport, the problem is only the blacklist.
We are running a Exchange Audit with Microsoft Support and they don't identify any transport problem on our Exchange plateform except we are not on last CU.
"All public IP of the farm are blacklisted by Spamcop and we can't request a new delisting."
It sounded as if this happened in the past before. If this is the case I am afraid you will have to get in touch with SpamCop.
For most of my clients we only filter and scan incoming emails but not outgoing. The email server will send direct. The desktop Endpoint will also scan incoming email again when it arrives. This is never an issue.
It sounded as if this happened in the past before. If this is the case I am afraid you will have to get in touch with SpamCop.
For most of my clients we only filter and scan incoming emails but not outgoing. The email server will send direct. The desktop Endpoint will also scan incoming email again when it arrives. This is never an issue.
What is the blacklist error says? Why it is marked as blacklist, can you let me know. There are several reason, like PTR issue.
Agree with Amit, good point about the PTR if this is a recurring issue.
What Wayne88 said.
All public IP of the farm are blacklisted by Spamcop and we can't request a new delisting.
There's not a thing you can do about it at this time. Spamcop has marked you as a persistent offender, and it will be some time before you can request another delisting. Your entire IP block has been blacklisted and reconfiguring your MTAs won't solve the problem.
Between now and the next delisting opportunity you must find out why they have marked you as a persistent offender and clean up the problem.
But I'd note this: If you're sending commercial email, there is very little chance they will delist you. Your outgoing email should not be triggering Spamcop traps unless you're sending to a bot-harvested list of email addresses.
All public IP of the farm are blacklisted by Spamcop and we can't request a new delisting.
There's not a thing you can do about it at this time. Spamcop has marked you as a persistent offender, and it will be some time before you can request another delisting. Your entire IP block has been blacklisted and reconfiguring your MTAs won't solve the problem.
Between now and the next delisting opportunity you must find out why they have marked you as a persistent offender and clean up the problem.
But I'd note this: If you're sending commercial email, there is very little chance they will delist you. Your outgoing email should not be triggering Spamcop traps unless you're sending to a bot-harvested list of email addresses.
ASKER
Dr. Klahn, I'm agree with you : I have to find why we are blacklisted.... But I'm searching some advice to search how to find my root cause.
I check PTR on all SMTP public send IP : OK (PTR point to dns name / dns name point to IP)
We are not using any robot to collect mail. The mail system is only used by "human" :).
I check PTR on all SMTP public send IP : OK (PTR point to dns name / dns name point to IP)
We are not using any robot to collect mail. The mail system is only used by "human" :).
ASKER CERTIFIED SOLUTION
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Thanks for getting back and glad you got the answer. Cheers!
ASKER
I solve my problem with Spamcop support.
https://www.experts-exchange.com/questions/29109338/Email-shows-as-sent-but-does-not-deliver-in-Exchange-2010-office-365-hybrid.html?anchor=a42625485¬ificationFollowed=209880998&anchorAnswerId=42625485#a42625485
https://blogs.technet.microsoft.com/exchange/2018/07/16/issue-with-july-updates-for-windows-on-an-exchange-server/