Process to protect Office 365 email domain from spoofing

Please provide me with guides and processes on how to protect Office 365 email domains from email spoofing.

We need to prevent our Office 365 users from receiving spoofed emails that look like they were sent from legitimate existing internal email addresses.
IT GuyNetwork EngineerAsked:
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JohnBusiness Consultant (Owner)Commented:
Exchange is not a top notch spam filter. You need a third party solution like Barracuda or Symantec

https://www.barracuda.com/landing/pages/spamfirewall?&a=[google_na]email_security_search&grp=enterprise_spam_filter_exact&ad=102196925901&kw=enterprise%20spam%20filter%20comparison&gclid=EAIaIQobChMI4d7cm6fg2AIVhAJpCh1i4gszEAAYAiAAEgLj6PD_BwE

http://www.symantec.com/anti-spam-software/

The reason for this is the the spam filtering engine really needs to work on Content. That means a good email from joe@domain.com will be received and a spoofed email from joe@domain.com will go to the bit bucket.

I use Mail.com myself, and their spam filtering is A-1.  I see exactly what I desribed above.
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IT GuyNetwork EngineerAuthor Commented:
I've been told by other Office 365 and Exchange administrators that there are ways of doing this (even though it will not be as effective as using one of the spam filters mentioned above).

For the time being I need to do this within Office 365 before we can start using a spam filter like one of the ones mentioned above.

How can this be done?
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JohnBusiness Consultant (Owner)Commented:
You need to install a pre-server with the spam filter to receive the mail and send it off to Exchange.
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JohnBusiness Consultant (Owner)Commented:
Alternatively, purchase the Microsoft hosted per seat / per month package that includes spam filtering. This may be better than a 3rd party solution.

And if you are already doing this (not clear from above), then ask Microsoft Support how to tune the spam filter.

We have clients with non-Microsoft hosted exchange and very, very little spam.
We have clients with Microsoft exchange and again very, very little spam.

The complete per seat / per month services include spam filtering.
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yo_beeDirector of Information TechnologyCommented:
From this read https://support.office.com/en-us/article/Office-365-email-anti-spam-protection-6a601501-a6a8-4559-b2e7-56b59c96a586 it seems to meet your needs and you may have this with your O365 and it maybe for John is referencing in his last comment.
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MaheshArchitectCommented:
Microsoft use Exchange Online Protection at backend of O365 as anti spam solution and provide u console for same
from EOP console you need to twick the settings if required
https://technet.microsoft.com/en-us/library/jj723153(v=exchg.150).aspx
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Jose Gabriel Ortega CastroCEOCommented:
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