I hope someone can shed some light onto thiw. None of the solutions I have found have worked.
A customer has an SBS 2003 server running exchange. They use SMTP for both incoming and outgoing mail.
Someone is sending 1000's of mails through their server as email@example.com
I have tried all sorts to block them but they appear to have random IP addresses. If I disable SMTP relay then nobody can send or recieve mails. If I turn on authentication then outside servers cannot send mail to their mail server.
This is NDR attack. Configure recipient filtering, smtp tarpitting.
Follow this article in full http://www.amset.info/exchange/spam-cleanup.asp
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