Sorry for asking again.... but you have not answered Q2 :-(
I need to reconfirm whether:
1. Doing this will overwrite my current DNS settings?
2. Doing this will overwrite my current EMAIL settings?
3. Doing this will overwrite my current Hosting settings?
4. If YES. What should I do to restore the settings after 'redoing the postfix/saslauthd'?
5. Will my current user not be able to use the email services during resetting?
6. Will this redo interrupt the DNS setting?
Hope you could answer all 6 questions.
I love you solution and hope to work out this problem...