Need user who submitted job in MeC mapping.

Not sure if this is the right forum but having a question about MeC - M3 eCollaborator and did not see a dedicated forum.

Currently building a mapping and want to send the user some info about the mapping. Using mailsender class - that all works fine. But I do not have the M3 user name who submitted the job.
When the M3 user who submitted the job is known CRS111MI can be used to find the e-mail address.

How to the user name whom submitted the job in a variable in the mapping?
The user is as UserJob in the *.rcv file in the logging... so MeC "knows" it - but how to get it in a variable.

Ps: also alternative ways to send submitting-user an e-mail during mapping execution are welcome!