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

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.
eimonkeyAsked:
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eimonkeyConnect With a Mentor Author Commented:
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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pegasysCommented:
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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eimonkeyAuthor Commented:
This solution was suggested to me by a colleague and it worked.
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