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Thank you so much, so far so good!
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Hello Experts,<br />
<br />
Currently we have all of our Exchange accounts in 365.<br />
I set myself to get the &quot;postmaster&quot; e-mails on undeliverable.<br />
<br />
I am currently getting a lot of these?<br />
<br />
Subject: Undeliverable: Your Flight Ticket Invoice 53518 - (our user)<br />
Sender: ourcompany@onmicrosoft.com<wbr /><br />
<br />
Our we really sending these out? &nbsp;I am concerned and not sure how or why our spam is increasing.<br />
<br />
I found this question on the website and it's what is going on with us. &nbsp;We have a spn record on our domain and they are coming frequent, so as of typing this, I&quot;m unclear if there is anything or any other settings I can do to protect our domain?<br />
<a href="https://www.experts-exchange.com/questions/28946520/Spoofing-email.html" rel="ugc">https://www.experts-exchange.com/questions/28946520/Spoofing-email.html</a><br />
<br />
Thank you for your help,<br />
<br />
Karen
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Hello Experts,

Currently we have all of our Exchange accounts in 365.
I set myself to get the "postmaster" e-mails on undeliverable.

I am currently getting a lot of these?

Subject: Undeliverable: Your Flight Ticket Invoice 53518 - (our user)
Sender: ourcompany@onmicrosoft.com

Our we really sending these out?  I am concerned and not sure how or why our spam is increasing.

I found this question on the website and it's what is going on with us.  We have a spn record on our domain and they are coming frequent, so as of typing this, I"m unclear if there is anything or any other settings I can do to protect our domain?
https://www.experts-exchange.com/questions/28946520/Spoofing-email.html

Thank you for your help,

Karen

365 Postmaster Spam

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

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.