Postfix removal - yikes

[Nick Edwards]

The following packages will be REMOVED:
  lsb lsb-core lsb-cxx lsb-desktop lsb-graphics lsb-languages lsb-multimedia
lsb-printing mailx postfix

I am going to use another non-debian (no repo) mail system so I need to
remove postfix, can someone offer hint on how to do this
without losing all the other files as well?

crazy to remove mailx since a system can send mail without postfix or
sendmail, exim, et al.

nicky
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