I discovered an email message at the end of an email converstation that seemed to be sent from my email account work account, but I definitely didn't sent it.
Our oficce administrator might have access to my work email account, but i am not sure.
Anyway, the message appears to have been sent from my work email account although it does not exist in 'sent' box, only as end message of a email conversation/chain. Is there anyway i could discover from what computer that message was sent?
The best thing to do is obtain the message headers from the email that was sent, this would have to be obtained from the recipient of the email.
The information there will indicate the IP address of the server that sent the email as well as some other useful information.
I have had this happen also many times. I usually just look at it and be like wtf and put it in the spam bin if its not already in there. It is possible someone stolen my session cookies and sent a message or forged the addressee or session hijacked my account or faked the sender. Since I don't know what to do about this, I don't worry about it too much since it seems to have happened to all the email accounts I have had at some time or another.