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Support XFINITY Internet Understand Email Error Messages and Their Codes

Introduction

When sending email, you'll occasionally receive an error message with its own code. Here's an explanation of the codes—along with a recommendation on how to fix each error. Note: In the event you need to contact your email administrator, be sure to include your error message. It contains important information.

Choose the error message you received from the list below:


ES000001 You are sending email from a dynamic/residential IP address. We don't allow subscribers to send email from a mail server other than smtp.comcast.net. You can send or receive email through the Comcast mail servers by using our webmail application or by configuring your mail client to connect properly. If you need to run your own mail server, please contact our Commercial Services organization at support_biz@cable.comcast.com.
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ES000010 You are sending email from dynamic/residential IP space. We don't allow residential/dynamic IP addresses to directly connect to our mail servers. Comcast classifies your mail server's IP address as dynamic if the reverse DNS does not comply with standard static naming conventions. You can ask your mail provider to review the settings of your email server to ensure we don't continue to block it. If your mail provider cannot change their naming conventions, have its representative contact our CSA Department.
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BL000000 Email from your mail server has been sent in patterns that are characteristic of spam. 
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BL000001 Your mail provider is listed on Spamhaus SBL/XBL, a list of mail providers who've been detected as having sent spam. Visit Spamhaus to remove the block.
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BL000010 Your mail provider is listed on the Cloudmark Sender Intelligence (CSI), a list of mail providers who've been detected as having sent spam. Visit CSI to remove the block.
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BL000011 Your mail provider is listed on the Spamhaus SBL/XBL and Cloudmark Sender Intelligence (CSI), two lists of mail providers who've been detected as having sent spam. Visit Spamhaus and CSI to remove the block.
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BL000100 Your mail provider is listed on SenderScore, a list of mail providers detected as having sent spam. Visit SenderScore to remove the block.
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BL000101 Your mail provider is listed on the Spamhaus SBL/XBL and SenderScore, two lists of mail providers who've been detected as having sent spam. Visit SenderScore and Spamhaus to remove the blocks.
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BL000110 Your mail provider is listed on the Cloudmark Sender Intelligence (CSI) and SenderScore, two lists of mail providers who've been detected as having sent spam. Visit CSI and SenderScore to remove the blocks.
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BL000111 Your mail provider is listed on Spamhaus SBL/XBL, Cloudmark Sender Intelligence (CSI) and SenderScore, three lists of mail providers who've been detected as having sent spam. Visit Spamhaus, CSI and SenderScore to remove the blocks.
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BL001000 Your mail provider is listed on TrendMicro MAPS, a list of mail providers who've been detected as having sent spam. Visit MAPS to remove the blocks.
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BL001001 Your mail provider is listed on Spamhaus SBL/XB and TrendMicro MAPS, two lists of mail providers who've been detected as having sent spam. Visit Spamhaus and MAPS to remove the blocks.
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BL001010 Your mail provider is listed on Cloudmark Sender Intelligence (CSI) and TrendMicro MAPS, two lists of mail providers who've been detected as having sent spam. Visit CSI and MAPS to remove the blocks.
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BL001011 Your mail provider is listed on Spamhaus SBL/XB, Cloudmark Sender Intelligence (CSI) and TrendMicro MAPS, three lists of mail providers who've been detected as having sent spam. Visit Spamhaus, CSI and MAPS to remove the blocks.
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BL001100 Your mail provider is listed on TrendMicro MAPS and SenderScore, two lists of mail providers who've been detected as having sent spam. Visit MAPS and SenderScore to remove the blocks.
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BL001101 Your mail provider is listed on Spamhouse SBL/XBL, TrendMicro MAPS and SenderScore, three lists of mail providers who've been detected as having sent spam. Visit Spamhaus, MAPS and SenderScore to remove the blocks.
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BL001110 Your mail provider is listed on Cloudmark Sender Intelligence (CSI), TrendMicro MAPS and SenderScore, three lists of mail providers who've been detected as having sent spam. Visit CSI, MAPS and SenderScore to remove the blocks.
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BL001111 Your mail provider is listed on Spamhaus SBL/XBL, Cloudmark Sender Intelligence (CSI) and TrendMicro MAPS, three lists of mail providers who've been detected as having sent spam. Visit Spamhaus, CSI and MAPS to remove the blocks.
 
Mail servers are typically shared by many users so it may be the case that another party using your mail server has sent spam, even if you haven’t. Make your email administrator aware of its outbound spam problem to avoid being blocked by us in the future. Removal requests can be sent to www.comcastsupport.com/rbl and will require the IP address of the blocked mail server (you can get this from your email administrator).

Below is an example of an error message and where you can find the IP address needed for your removal request.

Text reading:"550.12.34.56.78 blocked by . . .  " and a note that your blocked IP address would be listed here after the 550 code and before the word "blocked."

Find this article at:

http://customer.comcast.com/help-and-support/internet/email-errors/