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having Edge server or not is a on-premises requirement. <br />
Some customer says all emails must terminate at DMZ, then EDGE is a must.<br />
Usually, i don't see a reason if you can proove proofpoint gateway is a semi-controlled and act as your DMZ on email point of view.<br />
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to do recipient validation, proofpoint needs to have access to your ACtive directory via LDAPS to read your users. <br />
<br />
you can look at the help file (it might not exactly the same but it definitely have something like this. talk to helpdesk if you have issues finding it)<br />
<a href="http://support.proofpointessentials.com/index.php?/Knowledgebase/Article/View/42/11/active-directory-settings" rel="ugc">http://support.proofpointessentials.com/index.php?/Knowledgebase/Article/View/42/11/active-directory-settings</a>
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having Edge server or not is a on-premises requirement.
Some customer says all emails must terminate at DMZ, then EDGE is a must.
Usually, i don't see a reason if you can proove proofpoint gateway is a semi-controlled and act as your DMZ on email point of view.

to do recipient validation, proofpoint needs to have access to your ACtive directory via LDAPS to read your users.

you can look at the help file (it might not exactly the same but it definitely have something like this. talk to helpdesk if you have issues finding it)
http://support.proofpointessentials.com/index.php?/Knowledgebase/Article/View/42/11/active-directory-settings [http://support.proofpointessentials.com/index.php?/Knowledgebase/Article/View/42/11/active-directory-settings]

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can you highlight what other considerations needs to be addressed while setting up proofpoint gateway in DMZ
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can you highlight what other considerations needs to be addressed while setting up proofpoint gateway in DMZ

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<div class="content wysiwyg-content">
regarding proof point gateway<br />
<br />
Did we need Edge servers or not between Proofpoint and HUB?<br />
-How to do recipient validation
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regarding proof point gateway

Did we need Edge servers or not between Proofpoint and HUB?
-How to do recipient validation

proofpoint gateway

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.