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Sorry for the delay in responding, everything went pretty crazy and I didn't have chance to test out the solution. Have given it a try now and it looks like its working so thank you to both of you for your help.
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Sorry for the delay in responding, everything went pretty crazy and I didn't have chance to test out the solution. Have given it a try now and it looks like its working so thank you to both of you for your help.

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I think what I want to do is quite straightforward but I can't see the how to implement it.<br />
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We have some emails coming in to our exchange server from an external source that are duplicates of messages we already have, these are generated from a server outside our control so we can't stop them but they all have INTERNAL at the start of the subject line.<br />
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Quite simply what I want to do is get exchange to not delivery / delete any messages where the subject line starts INTERNAL but not any message that contain INTERNAL. So for example 'INTERNAL abc' would be deleted but 're: INTERNAL abc' wouldn't.<br />
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I thought I could implement this as a hub transport rule but I can only get that to work when the whole subject line matches, how do I enter INTERNAL followed by a wildcard?
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I think what I want to do is quite straightforward but I can't see the how to implement it.

We have some emails coming in to our exchange server from an external source that are duplicates of messages we already have, these are generated from a server outside our control so we can't stop them but they all have INTERNAL at the start of the subject line.

Quite simply what I want to do is get exchange to not delivery / delete any messages where the subject line starts INTERNAL but not any message that contain INTERNAL. So for example 'INTERNAL abc' would be deleted but 're: INTERNAL abc' wouldn't.

I thought I could implement this as a hub transport rule but I can only get that to work when the whole subject line matches, how do I enter INTERNAL followed by a wildcard?

Create an Exchange rule

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.