Whitelisting a sender in Exchange 2010

Recently took on admin duties for an on-premises Exchange Server 2010.

One of my Exchange users is not receiving an email he needs, and we suspect Exchange is filtering it.  (He's using a Mac, with the Mail app, not Microsoft Outlook, fyi.)

My question: what are the specific steps I would take to allow delivery of email messages from senders with addresses ending in @senderguy.com?
John AtkinsonIT ConsultantAsked:
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AmitIT ArchitectCommented:
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timgreen7077Exchange EngineerCommented:
Unless you have malware and/or spam filtering installed on exchange, then exchange itself isn't filtering it. do you know if you have that feature installed or not. Also does inbound mail come straight to you exchange servers, or do the mail hit an inbound gateway first that handles your mail hygiene, and the sends to your internal exchange. if that is the case, you will need to look at the inbound gateway first.
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John AtkinsonIT ConsultantAuthor Commented:
We don't have on-server spam filtering, as far as I know.  We do subscribe to an inbound gateway, (Duocircle.com) but the message collection there in our account does not contain any copies of the missing messages.
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timgreen7077Exchange EngineerCommented:
They may be rejecting it, and if so there will not be a copy. I don't know anything about Duocircle but see if you can whitelist the email address there and if so that should allow the email to be delivered successfully to your user. Also does the sender get any bounce backs or anything that you know of?
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AmitIT ArchitectCommented:
Do you have any update to Share.
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timgreen7077Exchange EngineerCommented:
Provided answers to author. Closing ticket unless author reopens requiring assistance.
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