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Spam emails are not being blocked

Posted on 2014-09-18
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Last Modified: 2015-07-14
Hello,

We currently have a mixed environment with office 365 and an onpremises Exchange server 2007. Our MX is still pointing to out onpremises Exchange 2007, meaning that communication are coming through our exchange first and then being forwarded to our Exchange Online account.

All of a sudden since this Monday, a good amount of spam emails are being forwarded to our inboxes(not even to our junk mail). It seems that our spam email settings are not working properly.

I have check on the spam settings and they look ok. I have talked to Office 365 and we ended on setting up a policy to delete messages from those spam domains but apparently spammers keep on changing their addresses so the policy is not that effective.

Any idea what else I can check?
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Question by:LuiLui77
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Expert Comment

by:Joshua Grantom
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where are you filtering spam? on your exchange box or do you have an appliance (IronPort, Barracuda Spam Filter, etc) before your exchange?
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Author Comment

by:LuiLui77
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Exchange box
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Expert Comment

by:Joshua Grantom
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Is the on premise exchange and Office 365 serving addresses on the exact same domain?
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Author Comment

by:LuiLui77
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Well, yes and no. When subscribing to Office 365 we subscribed with our "domain.com", but I noticed that Microsoft also created another domain: "companyname.onmicrosoft.com"

messages sent to domain.com are hiting our Exchange first and companyname.onmicrosoft.com hits Microsoft directly.
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LuiLui77 earned 0 total points
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Implemented APPRiver. very good cloud antispam solution and very nice support.
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Author Closing Comment

by:LuiLui77
Comment Utility
It was what I implemented and it is working very nicely.
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