Since WRKNAMSMTP probably should be disabled, the question doesn’t make sense. The CVTNAMSMTP command should have been run years ago making WRKNAMSMTP inoperative.
The question would come from a misunderstanding of how addressing is handled in OS releases during the past decade or so. I would recommend basic research into what WRKNAMSMTP and CVTNAMSMTP do first, then questions should present themselves about the resulting structures.
I don’t know what addresses you are keeping in the system alias table, but we use this code to update the local users:
CHGDIRE USRID(USER S1066666) USRDFNFLD((SMTPAUSRID SMTP USEREMAILNAME) (SMTPDMN SMTP ‘COMPANY.COM’))
I don’t remember how the usrdfnfld are linked to the SMTP names, but it works. We may have gotten the information from here: