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It has been brought to my attention that a few clients have been trying to send me emails to my account, however they keep getting them bounced back and I never receive them.

This is one of the messages they get:


Sorry, we were unable to deliver your message to the following address:

Remote host said: 550 http://www.spamcop.net/bl.shtml?" [RCPT_TO]


What does that mean and how do we fix it? I don't understand if it's a problem on the senders end or ours.

Thank you for any prompt assistance.


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>- Remote host said: 550 http://www.spamcop.net/bl.shtml? = nm16-vm0.access.bullet.mail.sp2.yahoo.com has been placed on our list of known spam sources, which we publish, because it is sending spam to us and our users.

Your ISP is using Blocking Lists to help defend against spam, and your clients are using Yahoo to send their email.

- Don D'Minion - SpamCop Admin -

- Service[at]Admin.SpamCop.net -


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Hello Richard,

Looks to me like your e-mail service is using the SpamCop blocking list to decline incoming mail from Yahoo (as and when specific Yahoo servers are on the SCbl). The link you posted - or a link from it - tells the story. Well it would, except it is slightly garbled - lose the quote at the end of the URI. Since that specific Yahoo server is just about to time off the blocklist, the salient features currently seen are recorded listed in bl.spamcop.net (

If there are no reports of ongoing objectionable email from this system it will be delisted automatically in approximately 1 hours.

Causes of listing

System has sent mail to SpamCop spam traps in the past week (spam traps are secret, no reports or evidence are provided by SpamCop)

SpamCop users have reported system as a source of spam less than 10 times in the past week

Additional potential problems

(these factors do not directly result in spamcop listing)

Too many delisting requests were made. Next request might be allowed after 4.1 days

Because of the above problems, express-delisting is not available

Listing History

In the past 11.0 days, it has been listed 9 times for a total of 5.1 days

Other hosts in this "neighborhood" with spam reports

Which means, in a nutshell, that delivery from or through Yahoo to your e-mail service is always going to be problematic - sometimes working, sometimes not. That's because of your provider's decision to use the list to BLOCK. Ideally the SCBL should not be used to deny delivery and SC itself recommends use to mark or divert mail, in any event to allow review of material sent through a server on the blocklist** since there can be false positives. The SCbl reacts comparatively quickly to a server sending spam but stops listing within 24 hours of the spam stopping.

If you have any influence with your mail provider you might point out that they are using the SCbl contrary to primary recommendation and invite them to reconsider their practice, if they are able.


We recommend that when using any spam filtering method, users be given access to the filtered mail - don't block the mail as documented here, but store it in a separate mailbox. Or tag it and provide users documentation so that they can filter based on the tags in their own MUA.
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