Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello Dave,
In Office 365, we use Exchange Online Protection to protect the environment of the mail service.
In EOP, we have **malware filter, connection filter,spam filter.. etc.**We can also use transport rules to set the specific SPF records for the imcoming emails. You are also allowed to add domain name or IP addresses to the black/allow lists of your organization. Set up rules or change the email header based on the filters for the incoming emails.
Here are some articles for your reference:
EOP featureshttps://technet.microsoft.com/en-us/library/dn762130(v=exchg.150).aspx
Configure the connection filter policy
https://technet.microsoft.com/en-us/library/jj200718(v=exchg.150).aspx
Configure your spam filter policieshttps://technet.microsoft.com/en-us/library/jj200684(v=exchg.150).aspx
Best Regards,
Alison