Query: Will uninstalling smail result in breaking of any other packages?

[rajibando]

This query is in connection with my other post, Query: How to Set Up a local smtp email server from own system? (http://knoppix.net/forum/threads/33809-Query-How-to-Set-Up-a-local-smtp-email-server-from-own-system)

The query is pertinent for my Knoppix 7.2.0.
But why didn't I upgrade to the latest version? Because the version works perfectly well for my laptop and is sufficient for my daily computing needs.

[rajibando]

smail
Reverse Depends:

|uucp
rmail
postfix
exim4-config
Among the four, only rmail is installed.

rmail: /usr/bin/rmail /usr/sbin/rmail /usr/bin/X11/rmail /usr/share/man/man8/rmail.8.gz
rmail
Reverse Depends:

uucp
sendmail
uucp
Reverse Depends:

tua
uucp-lmtp
uucpsend
cu
None installed. So shall I proceed and install exim4?
I checked Debian archive for ancient obsolete releases. Presently, doesn't appear to be working. Any information about the smail package's origins would have helped.