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Delete the question, abandoned.
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Since the question ask for anything to do and investigate, I have shared some area of check as part of the investigation. If they are not valid pointer for checking then I suggest just delete the question away.
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Hello, <br />
<br />
We have a manager expecting emails coming from worknwearuniforms.com. &nbsp;<br />
<br />
Our Office 365 messaging system is blocking the emails coming from worknwearuniforms.com because the spam confidence level is high. &nbsp;<br />
<br />
I just want to see if there is anything we could do or investigate before we do the unblock. <br />
<br />
Please advise. <br />
<br />
Thanks.
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Hello, 

We have a manager expecting emails coming from worknwearuniforms.com.  

Our Office 365 messaging system is blocking the emails coming from worknwearuniforms.com because the spam confidence level is high.  

I just want to see if there is anything we could do or investigate before we do the unblock. 

Please advise. 

Thanks.

potential spam investigation.

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.

Microsoft 365

Network security consists of the policies adopted to prevent and monitor authorized access, misuse, modification, or denial of a computer network and network-accessible resources. Network security involves the authorization of access to data in a network, and covers a variety of computer networks; conducting transactions and communications among businesses, government agencies and individuals. Networks can be private, such as within a company, and others which might be open to public access.

Network Security

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.