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Get in touch with your ISP for this issue.
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@utopianabhi Yes you are right :)
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Our mail domain has been put on backscatter.org. &nbsp;I need to find out more info on sender callouts and how to disable.
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Our mail domain has been put on backscatter.org.  I need to find out more info on sender callouts and how to disable.

How do I disable sender callouts in Exchange 2003?

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.