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We receive way more spam on a shared mailbox than on the users mailbox (the default anti-spam filter is activated on the domain). All the mailboxes are on Office365. Is there a difference in how spam is stopped on normal mailbox'es in compare to shared mailboxes?
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We receive way more spam on a shared mailbox than on the users mailbox (the default anti-spam filter is activated on the domain). All the mailboxes are on Office365. Is there a difference in how spam is stopped on normal mailbox'es in compare to shared mailboxes?

Lot of spam on a shared mailbox on Office365

Office 365 is a group of software plus services subscriptions that provides productivity software and related services to its subscribers. Office 365 allows the use of Microsoft Office apps on Windows and OS X, provides storage space on Microsoft's cloud storage service OneDrive, and grants 60 Skype minutes per month. Office 365 includes e-mail and social networking services through hosted versions of Exchange Server, Skype for Business Server, SharePoint and Office Online, integration with Yammer, as well as access to the Office software. All of Office 365's components can be managed and configured through an online portal; users can be added manually, imported from a CSV file, or Office 365 can be set up for single sign-on with a local Active Directory using Active Directory Federation Services.