What's causing email spoofing FROM my Outlook account

I detected email spoofing of my company email address through a notification that a message was undeliverable. My sys admin said to install antispam software on my Mac, but is that the problem? Does that protect against sending spam too? Is a virus on my machine a possibility? Or is it more likely on the server?
I'm not highly technical on system issues so I'm not sure what information is useful in detecting the source of the spoofing. Obviously it's important that my business email isn't spamming or infecting clients' machines, who are mostly PC, by the way. I use Outlook 2011 and also have an IMAP account on Apple Mail for the same company email. My Outlook account syncs to MS Sharepoint online.
I have no antivirus software installed. I use Flash and Java for work. I'm running Mavericks 10.9.4 and installed the update July 12, 2014. My system is running very slowly now, but that could be an unrelated issue with this 2008 model laptop.
Any thoughts or similar experiences would be much appreciated.

Thanks for the followup, Camelot. All I have to work with are the headers included in the delivery failure notification. None of those IP addresses match my machine, so that's good. But they all match our company server at outlook.com. I'll verify that with the sys admin tomorrow.
It looks like my email address was spoofed in forwarding some spam about 6 hours after it was received. The initial spam message was sent to a group info@ address at my company from a domain in Asia and the content was in an Asian language script. That was then somehow forwarded from 'me' to a Mexican domain and rejected. [email protected]   That address isn't in any contacts list on my machine and I've never seen it before.
It seems like a nasty little virus, but being a Mac user, I'm not at all experienced in those !
I also appreciate your comments on the SMTP protocol. It's really a shame it's so easy to do. I'm aware that there's a code you can set on your account that will verify an email came from you. My mail host added it to my personal account.
Again, thank you for the thoughtful and detailed reply. Very helpful.

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