I need to configure sendmail on AIX 6.1 to send out mail with the From: header set to the effective userid, instead of the real userid.
For example: I login to the server using usera. I then su - userb. I then mailx -s Test email@example.com I check firstname.lastname@example.org's email and I have the test message but it appears from usera not userb.
I've tried the instructions in https://www-304.ibm.com/support/docview.wss?uid=isg1IZ63173 but they didn't have any impact. I've found lots of posts about how to fix the reverse problem (every email is sent as if from root), and lots and lots of information about masquerading, and domain rewriting, but nothing that addresses my problem.
I don't think this is necessarily an AIX specific issue, but I am running AIX 6.1 TL 6100-08-00-1241. Any help is appreciated