How to Remove an IP Address from a Blacklist SpamCannibal

Go to http://spamcannibal.org/cannibal.cgi
In the right side menu click Lookup IP
Enter mail server IP address into the field and click Lookup IP
Check why you got listed in the first place
If your mail server is missing PTR (reverse DNS) record, add it
If other problem resolve it first
If the problem is resolved go again to http://spamcannibal.org/cannibal.cgi
Click Contact in the right side menu
Scroll to the bottom
Enter your IP address
Enter your Email
Describe why you got listed and what you did to solve the problem
Submit

NOTE: Don't try to get de-listed from any blacklist BEFORE you solved the problem added you to the blacklist in the first place

Comments

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Error "<#5.5.2 smtp;554 5.5.2 Invalid data in message> #SMTP#" when you send attachment in your mail

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Update #1: Default header size limit in Exchange 2007 is 64K.Update #2: It might be the SMTP version problem. Mail is rejected with CONTENT-DISPOSITION error (overly long message header field for CONTENT-DISPOSITION) but not for all SMTP servers (same mail sent through different SMTP servers). If you send mail with attachment that has name longer than 50 characters from Exchange 2007 directly through DNS you may encounter this error, but if you send same mail from Exchange 2007 through smart host (other than Exchange) mail is d…

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