Spam emails are not being blocked

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?
LuiLui77Asked:
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Joshua GrantomSenior Systems AdministratorCommented:
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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LuiLui77Author Commented:
Exchange box
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Joshua GrantomSenior Systems AdministratorCommented:
Is the on premise exchange and Office 365 serving addresses on the exact same domain?
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LuiLui77Author Commented:
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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LuiLui77Author Commented:
Implemented APPRiver. very good cloud antispam solution and very nice support.
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LuiLui77Author Commented:
It was what I implemented and it is working very nicely.
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