How to update SMTP Server name to be different in Siebel GUI using backend

Hello,

I am trying to find a way to update the SMTP server name to be either  NULL or 'XXXXXXX'  through back end( Database)

for only those who has Organization as default

through the below tables I could not find a way to update

S_CM_PROF_PARM, S_CM_PROF, S_CM_CNCTR

Internet SMTP/POP3 Server

Can someone shed some light on how to update the value

Thanks for your help

Albert