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554 Transaction Failed : Cannot send message due to possible abuse
I get the message from Norton when using Outlook to send e-mail :
554 Transaction Failed : Cannot send message due to possible abuse; please visit http://postmaster.yahoo.com/abuse_smtp.html for more information.
How can I stop this from occurring as there is no abuse on the e-mail and it isn't the number of destination addresses as it occurs for single addresses upto over 20 addresses in the To and/or CC in Outlook.