how do I get Microsoft Exchange to treat all email from another mail server as safe ?

Hi,
We have all incoming email scanned Trend Micro Hosted Email Security - an external server.

However we seem to be getting a proportion of messages that get through Trend's email scanning host and then get bounced as spam by content filtering in Microsoft Exchange.

None of the emails I've checked so far are spam i.e. they are all valid.

The obvious solution that occurs to me is to get Microsoft Exchange to 'trust' Trend's email servers and ensure that all emails scanned by the Trend servers are marked as 'safe' by Microsoft Exchange.

Can this be done ?  If so how do I do it ?
Michael GreenSenior IT Consultant / IT Project ManagerAsked:
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Vijaya Babu SekarConnect With a Mentor Associate Ops ManagerCommented:
if you add as whitelist, it will not scanning the mail content from Trend. so you need to add the white list , domain name or ip list.

Thanks.
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Vijaya Babu SekarAssociate Ops ManagerCommented:
if you have Trend for External SPAM filter , you can disable content filtering in Exchange server end.


if you want to disabled content filter for external mails

Set-ContentFilterConfig -ExternalMailEnabled $false

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Thanks.
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Michael GreenSenior IT Consultant / IT Project ManagerAuthor Commented:
Hi,
Yes I had already thought of that.  The issue is that even though the Exchange server is front ended by Trend's server its also still internet facing - so I wanted to only disable content filtering for mail coming from the Trend server i.e. leave content filtering on for anything sent directly to our Exchange server.

Is there any way to do that ? e.g. by IP ranging ?

Regards
MIchael
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