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Outlook 2011 Mac error 4.7.0 [C7]  5.7.1 [C6] Too Much Spam

Posted on 2013-06-16
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Last Modified: 2013-07-22
Running Outlook 2011 for Mac. Outgoing emails are not sending and are getting stuck in the outbox. Incoming emails are not a problem. Error message says either:

4.7.0 [C7] Too much spam
or
5.7.1 [C6] Too much spam

Domain is clear and no accounts have been flagged.
Has anyone seen this? Any suggestions?
Thanks.
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Question by:eimonkey
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3 Comments
 
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Expert Comment

by:pegasys
ID: 39294194
This is a SMTP server message. This is probably because your IP address which you are sending the mail from is blacklisted.

Check your IP on this site for blacklisting:

http://whatismyipaddress.com/blacklist-check

Then contact the relevant blacklist and ask them to remove your IP.
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Accepted Solution

by:
eimonkey earned 0 total points
ID: 39333313
It turns out the IP address assigned to the modem by the service provider through DHCP was probably blacklisted. Simply resetting the modem solved the problem.
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Author Closing Comment

by:eimonkey
ID: 39345433
This solution was suggested to me by a colleague and it worked.
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