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So you have 520 different domains? How many mailboxes total? This might help us to determine the best solution.<br />
<br />
Having said that, best practice is that any email not needing to be processed by the Exchange server should never get to the Exchange server in the first place. Therefore you really should have some sort of firewall with anti-spam in place to eliminate this irrelevant email before it ever starts wasting your Exchange server's time. This also helps to prevent DoS attacks against the company.<br />
<br />
You don't have to buy any hardware either, there are lots of 3rd party companies that can look after this for you.
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So you have 520 different domains? How many mailboxes total? This might help us to determine the best solution.

Having said that, best practice is that any email not needing to be processed by the Exchange server should never get to the Exchange server in the first place. Therefore you really should have some sort of firewall with anti-spam in place to eliminate this irrelevant email before it ever starts wasting your Exchange server's time. This also helps to prevent DoS attacks against the company.

You don't have to buy any hardware either, there are lots of 3rd party companies that can look after this for you.

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Thank you Alan for incredible tip...<br />
This software is awesome, exactly what I need !!!<br />
<br />
We use SMSMSE... but in conjunction with ORF &nbsp;is real hit...<br />
<br />
Best Regards<br />
joco
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Thank you Alan for incredible tip...
This software is awesome, exactly what I need !!!

We use SMSMSE... but in conjunction with ORF  is real hit...

Best Regards
joco

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Excellent - glad you like it :)<br />
<br />
Alan
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<div class="content wysiwyg-content">
Hello Everyone ...<br />
<br />
I have big problems solving following task in my Exchange 2007 organisation:<br />
<br />
I must accept emails only from our 520 clients domains all other should be rejected.<br />
I tried with Transport Rules but rule is too long and also does not work when separated in 3 rules...<br />
<br />
Please HELP<br />
<br />
Joco
</div>
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Hello Everyone ...

I have big problems solving following task in my Exchange 2007 organisation:

I must accept emails only from our 520 clients domains all other should be rejected.
I tried with Transport Rules but rule is too long and also does not work when separated in 3 rules...

Please HELP

Joco

Need help for Exchange 2007

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.