Yes of course. Technically the mail administrator, who is your colleague can do this and is frequently asked to do so. Also others may have been provided with access to your e-mail (without letting you know), quite common practice.
Refer to them as your colleague - although co-worker is fine.
A co-worker, a peer or a colleague.
associates, co-worker, acquaintances
When you are asked to describe your ideal co-worker in a job interview most people will say that they want someone who is reliable and responsible. They also like someone who easy to get along with, and who is able to work well as a team.
Sometimes a person will have to work with someone who is a problematic co-worker.
No, if you have anything to say to a co-worker it is always better to speak about it as then there is no documented evidence of emails. I do have to add that it is always better to not get personally involved with co-workers in any way as if there is a fall out in the future it can make things very bad, depressing, and awkward at work. Be careful with this situation.
co-worker
associates, co-worker, acquaintances
He could be interested, he could just be nosey and telling people at work things you may tell him back or he could have a weird stalking issue where your concerned. He only knows for sure.
A co-workerA employeeOr a person that works with you
"Co-worker" is a compound word, consisting of the prefix "co-" and the word "worker".
The cast of Where I Work - 2011 includes: Dave Emmert as Co-Worker Arlie Hammons as Bigger Boss Beniam Johnson as Ron Bartley Johanna Kelly as Co-Worker Carlen Kernish as Boss