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Email bounce back messages

Updated 9/15/2017 4:21:02 PM by Comcast Expert
Email

Introduction

This article applies to Microsoft® Hosted Exchange customers who have not yet been migrated to Microsoft® Office 365. If you are currently using Office 365, please visit Microsoft’s Set up Office 365 for business support page.

Code BL006
Code BL007
554 Error
452 Error
Exceeded Email Limit
Repeated Error Messages

Codes and errors messages

Code BL006

Mail to Comcast is rejected and is returned with an error message containing the code BL006. What does this mean?

Your mail could not be delivered because your mail provider is listed on the Spamhaus SBL/XBL. The Spamhaus SBL/XBL is a list of mail providers who have been detected as sending spam by Spamhaus. Comcast uses this list to protect its subscribers from receiving spam.

How do I get my email through?

It is important that your email provider is aware of their outbound spam problem to avoid being blocked by Comcast in the future. When contacting your email provider you should include the error message contained in the email that alerted you to this problem. This error message contains important information to help your email provider resolve this issue. Either you or your mail provider can visit Spamhaus' website by visiting http://www.spamhaus.org/lookup.lasso in order to have this block removed.

Code BL007

Mail to Comcast is rejected and is returned with an error message containing the code BL007. What does this mean?

Your email could not be delivered because your email provider is listed on the Cloudmark Sender Intelligence (CSI). CSI is a list of IP addresses which have been detected as sending spam. Comcast uses this list to protect its subscribers from receiving spam.

How do I get my email through?

It is important that your email provider is aware of their outbound spam problem to avoid being blocked by Comcast in the future. When contacting your email provider, you should include the error message contained in the email that alerted you to this problem. This error message contains important information to help your email provider resolve this issue. To address this issue, either you or your email provider can visit the CSI website by clicking here, in order to request removal.

554 Error

When I try to email specific Comcast Business addresses, I get a bounce back message containing a 554 error message, which links to this page.

You have been blocked from emailing the Comcast network because we have determined that your mail server does not properly identify itself when attempting to connect to the Comcast mail servers. This process is known as Reverse DNS and associates your mail server's IP address into a domain name for Comcast to know who is attempting to send email into our network. Individuals who send spam commonly hide their Reverse DNS to avoid being detected when sending email.

How do I get this resolved?

Your mail server's IP address is not blocked by Comcast. As soon as your mail administrator properly configures Reverse DNS on your mail server, you will be able to email the Comcast network again. When contacting your email administrator you should include the error message contained in the email that alerted you to this problem. This error message contains important information to help your email administrator resolve this issue.

452 Error

When I try to email specific Comcast Business addresses, I get a message delayed notification containing a 452 error message.

This error results for several reasons. This error should be treated as a temp-fail and can be retried.

How do I get this resolved?

Your mail server's IP address is not blocked by Comcast. As soon as your mail administrator properly configures Reverse DNS on your mail server, you will be able to email the Comcast network again. When contacting your email administrator you should include the error message contained in the email that alerted you to this problem. This error message contains important information to help your email administrator resolve this issue.

Exceeded Email Limit

Why did I receive an email titled 'You have exceeded Comcast's E-Mail Limit'?

As a part of Comcast's ongoing efforts to protect our customers, Comcast will temporarily suspend a customer's ability to send email if a customer generates abnormally high outbound email traffic or a significant amount of email appears to be spam. In this case, a customer's email may be suspended for up to one hour per occurrence. To prevent re-occurrences customers should check the content of their messages (including any URLs in their signature file), the number of undeliverable recipients, and volume of mail being sent. For further assistance please contact Customer Security Assurance at 1-888-565-4329.

Repeated Errors

What can I do if I keep receiving an error message when I try to send email?

Comcast's security experts have observed an increase in spamming exploits - specifically, attempts by spammers to hijack and use unprotected or infected computers to deliver their spam. The spammers' intent is to disguise their own identities and they can accomplish these attacks without the knowledge of the computer owner. Therefore, if you received one of these email error messages, it's possible that your computer is being used by these spammers without your authorization.  

If you received an error message when trying to send email it is possible that your computer is infected with a virus and you may need to take immediate actions to clean and help protect your computer. To stop any unauthorized access to your computer please follow the steps below:
 

  • Visit http://www.microsoft.com/security/ to make sure that you have the latest patches and updates from Microsoft.

  • Install a personal firewall or anti-virus software to help secure your PC.

  • Have your computer professionally cleaned at your local computer or electronics retailer .

  • Reset your email password to prevent unauthorized access into your email account.
     

If you are certain that your PC is not infected with a virus and you send out a large number of recipients per hour, you are encouraged to reduce your hourly volume to 1,000 recipients to avoid email interruption.

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